# UnicodeSet Class Reference

A mutable set of Unicode characters and multicharacter strings. More...

`#include <uniset.h>`

Inheritance diagram for UnicodeSet:

## Public Types
enum | { MIN_VALUE = 0, MAX_VALUE = 0x10ffff }
## Public Member Functions
UBool | isBogus (void) const
| Determine if this object contains a valid set.
void | setToBogus ()
| Make this UnicodeSet object invalid.
| UnicodeSet ()
| Constructs an empty set.
| UnicodeSet (UChar32 start, UChar32 end)
| Constructs a set containing the given range.
| UnicodeSet (const UnicodeString &pattern, UErrorCode &status)
| Constructs a set from the given pattern.
| UnicodeSet (const UnicodeString &pattern, uint32_t options, const SymbolTable *symbols, UErrorCode &status)
| Constructs a set from the given pattern.
| UnicodeSet (const UnicodeString &pattern, ParsePosition &pos, uint32_t options, const SymbolTable *symbols, UErrorCode &status)
| Constructs a set from the given pattern.
| UnicodeSet (const UnicodeSet &o)
| Constructs a set that is identical to the given UnicodeSet.
virtual | ~UnicodeSet ()
| Destructs the set.
UnicodeSet & | operator= (const UnicodeSet &o)
| Assigns this object to be a copy of another.
virtual UBool | operator== (const UnicodeSet &o) const
| Compares the specified object with this set for equality.
UBool | operator!= (const UnicodeSet &o) const
| Compares the specified object with this set for equality.
virtual UnicodeFunctor * | clone () const
| Returns a copy of this object.
virtual int32_t | hashCode (void) const
| Returns the hash code value for this set.
USet * | toUSet ()
| Produce a USet * pointer for this UnicodeSet.
const USet * | toUSet () const
| Produce a const USet * pointer for this UnicodeSet.
UBool | isFrozen () const
| Determines whether the set has been frozen (made immutable) or not.
UnicodeFunctor * | freeze ()
| Freeze the set (make it immutable).
UnicodeFunctor * | cloneAsThawed () const
| Clone the set and make the clone mutable.
UnicodeSet & | set (UChar32 start, UChar32 end)
| Make this object represent the range `start - end`.
UnicodeSet & | applyPattern (const UnicodeString &pattern, UErrorCode &status)
| Modifies this set to represent the set specified by the given pattern, optionally ignoring white space.
UnicodeSet & | applyPattern (const UnicodeString &pattern, uint32_t options, const SymbolTable *symbols, UErrorCode &status)
| Modifies this set to represent the set specified by the given pattern, optionally ignoring white space.
UnicodeSet & | applyPattern (const UnicodeString &pattern, ParsePosition &pos, uint32_t options, const SymbolTable *symbols, UErrorCode &status)
| Parses the given pattern, starting at the given position.
virtual UnicodeString & | toPattern (UnicodeString &result, UBool escapeUnprintable=FALSE) const
| Returns a string representation of this set.
UnicodeSet & | applyIntPropertyValue (UProperty prop, int32_t value, UErrorCode &ec)
| Modifies this set to contain those code points which have the given value for the given binary or enumerated property, as returned by u_getIntPropertyValue.
UnicodeSet & | applyPropertyAlias (const UnicodeString &prop, const UnicodeString &value, UErrorCode &ec)
| Modifies this set to contain those code points which have the given value for the given property.
virtual int32_t | size (void) const
| Returns the number of elements in this set (its cardinality).
virtual UBool | isEmpty (void) const
| Returns `true` if this set contains no elements.
virtual UBool | contains (UChar32 c) const
| Returns true if this set contains the given character.
virtual UBool | contains (UChar32 start, UChar32 end) const
| Returns true if this set contains every character of the given range.
UBool | contains (const UnicodeString &s) const
| Returns `true` if this set contains the given multicharacter string.
virtual UBool | containsAll (const UnicodeSet &c) const
| Returns true if this set contains all the characters and strings of the given set.
UBool | containsAll (const UnicodeString &s) const
| Returns true if this set contains all the characters of the given string.
UBool | containsNone (UChar32 start, UChar32 end) const
| Returns true if this set contains none of the characters of the given range.
UBool | containsNone (const UnicodeSet &c) const
| Returns true if this set contains none of the characters and strings of the given set.
UBool | containsNone (const UnicodeString &s) const
| Returns true if this set contains none of the characters of the given string.
UBool | containsSome (UChar32 start, UChar32 end) const
| Returns true if this set contains one or more of the characters in the given range.
UBool | containsSome (const UnicodeSet &s) const
| Returns true if this set contains one or more of the characters and strings of the given set.
UBool | containsSome (const UnicodeString &s) const
| Returns true if this set contains one or more of the characters of the given string.
int32_t | span (const UChar *s, int32_t length, USetSpanCondition spanCondition) const
| Returns the length of the initial substring of the input string which consists only of characters and strings that are contained in this set (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE), or only of characters and strings that are not contained in this set (USET_SPAN_NOT_CONTAINED).
int32_t | span (const UnicodeString &s, int32_t start, USetSpanCondition spanCondition) const
| Returns the end of the substring of the input string according to the USetSpanCondition.
int32_t | spanBack (const UChar *s, int32_t length, USetSpanCondition spanCondition) const
| Returns the start of the trailing substring of the input string which consists only of characters and strings that are contained in this set (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE), or only of characters and strings that are not contained in this set (USET_SPAN_NOT_CONTAINED).
int32_t | spanBack (const UnicodeString &s, int32_t limit, USetSpanCondition spanCondition) const
| Returns the start of the substring of the input string according to the USetSpanCondition.
int32_t | spanUTF8 (const char *s, int32_t length, USetSpanCondition spanCondition) const
| Returns the length of the initial substring of the input string which consists only of characters and strings that are contained in this set (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE), or only of characters and strings that are not contained in this set (USET_SPAN_NOT_CONTAINED).
int32_t | spanBackUTF8 (const char *s, int32_t length, USetSpanCondition spanCondition) const
| Returns the start of the trailing substring of the input string which consists only of characters and strings that are contained in this set (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE), or only of characters and strings that are not contained in this set (USET_SPAN_NOT_CONTAINED).
virtual UMatchDegree | matches (const Replaceable &text, int32_t &offset, int32_t limit, UBool incremental)
| Implement UnicodeMatcher::matches().
virtual void | addMatchSetTo (UnicodeSet &toUnionTo) const
| Implementation of UnicodeMatcher API.
int32_t | indexOf (UChar32 c) const
| Returns the index of the given character within this set, where the set is ordered by ascending code point.
UChar32 | charAt (int32_t index) const
| Returns the character at the given index within this set, where the set is ordered by ascending code point.
virtual UnicodeSet & | add (UChar32 start, UChar32 end)
| Adds the specified range to this set if it is not already present.
UnicodeSet & | add (UChar32 c)
| Adds the specified character to this set if it is not already present.
UnicodeSet & | add (const UnicodeString &s)
| Adds the specified multicharacter to this set if it is not already present.
UnicodeSet & | addAll (const UnicodeString &s)
| Adds each of the characters in this string to the set.
UnicodeSet & | retainAll (const UnicodeString &s)
| Retains EACH of the characters in this string.
UnicodeSet & | complementAll (const UnicodeString &s)
| Complement EACH of the characters in this string.
UnicodeSet & | removeAll (const UnicodeString &s)
| Remove EACH of the characters in this string.
virtual UnicodeSet & | retain (UChar32 start, UChar32 end)
| Retain only the elements in this set that are contained in the specified range.
UnicodeSet & | retain (UChar32 c)
| Retain the specified character from this set if it is present.
virtual UnicodeSet & | remove (UChar32 start, UChar32 end)
| Removes the specified range from this set if it is present.
UnicodeSet & | remove (UChar32 c)
| Removes the specified character from this set if it is present.
UnicodeSet & | remove (const UnicodeString &s)
| Removes the specified string from this set if it is present.
virtual UnicodeSet & | complement (void)
| Inverts this set.
virtual UnicodeSet & | complement (UChar32 start, UChar32 end)
| Complements the specified range in this set.
UnicodeSet & | complement (UChar32 c)
| Complements the specified character in this set.
UnicodeSet & | complement (const UnicodeString &s)
| Complement the specified string in this set.
virtual UnicodeSet & | addAll (const UnicodeSet &c)
| Adds all of the elements in the specified set to this set if they're not already present.
virtual UnicodeSet & | retainAll (const UnicodeSet &c)
| Retains only the elements in this set that are contained in the specified set.
virtual UnicodeSet & | removeAll (const UnicodeSet &c)
| Removes from this set all of its elements that are contained in the specified set.
virtual UnicodeSet & | complementAll (const UnicodeSet &c)
| Complements in this set all elements contained in the specified set.
virtual UnicodeSet & | clear (void)
| Removes all of the elements from this set.
UnicodeSet & | closeOver (int32_t attribute)
| Close this set over the given attribute.
virtual UnicodeSet & | removeAllStrings ()
| Remove all strings from this set.
virtual int32_t | getRangeCount (void) const
| Iteration method that returns the number of ranges contained in this set.
virtual UChar32 | getRangeStart (int32_t index) const
| Iteration method that returns the first character in the specified range of this set.
virtual UChar32 | getRangeEnd (int32_t index) const
| Iteration method that returns the last character in the specified range of this set.
int32_t | serialize (uint16_t *dest, int32_t destCapacity, UErrorCode &ec) const
| Serializes this set into an array of 16-bit integers.
virtual UnicodeSet & | compact ()
| Reallocate this objects internal structures to take up the least possible space, without changing this object's value.
virtual UClassID | getDynamicClassID (void) const
| Implement UnicodeFunctor API.
## Static Public Member Functions
static UnicodeSet * | fromUSet (USet *uset)
| Get a UnicodeSet pointer from a USet.
static const UnicodeSet * | fromUSet (const USet *uset)
| Get a UnicodeSet pointer from a const USet.
static UBool | resemblesPattern (const UnicodeString &pattern, int32_t pos)
| Return true if the given position, in the given pattern, appears to be the start of a UnicodeSet pattern.
static UnicodeSet * | createFrom (const UnicodeString &s)
| Makes a set from a multicharacter string.
static UnicodeSet * | createFromAll (const UnicodeString &s)
| Makes a set from each of the characters in the string.
static UClassID | getStaticClassID (void)
| Return the class ID for this class.
## Friends
class | USetAccess
class | UnicodeSetIterator

## Detailed Description

A mutable set of Unicode characters and multicharacter strings.

Objects of this class represent character classes used in regular expressions. A character specifies a subset of Unicode code points. Legal code points are U+0000 to U+10FFFF, inclusive.

The UnicodeSet class is not designed to be subclassed.

`UnicodeSet` supports two APIs. The first is the operand API that allows the caller to modify the value of a `UnicodeSet` object. It conforms to Java 2's `java.util.Set` interface, although `UnicodeSet` does not actually implement that interface. All methods of `Set` are supported, with the modification that they take a character range or single character instead of an `Object`, and they take a `UnicodeSet` instead of a `Collection`. The operand API may be thought of in terms of boolean logic: a boolean OR is implemented by `add`, a boolean AND is implemented by `retain`, a boolean XOR is implemented by `complement` taking an argument, and a boolean NOT is implemented by `complement` with no argument. In terms of traditional set theory function names, `add` is a union, `retain` is an intersection, `remove` is an asymmetric difference, and `complement` with no argument is a set complement with respect to the superset range `MIN_VALUE-MAX_VALUE`

The second API is the `applyPattern()`/`toPattern()` API from the `java.text.Format`-derived classes. Unlike the methods that add characters, add categories, and control the logic of the set, the method `applyPattern()` sets all attributes of a `UnicodeSet` at once, based on a string pattern.

Pattern syntax

Patterns are accepted by the constructors and the `applyPattern()` methods and returned by the `toPattern()` method. These patterns follow a syntax similar to that employed by version 8 regular expression character classes. Here are some simple examples:

> `[]` | No characters
> `[a]` | The character 'a'
> `[ae]` | The characters 'a' and 'e'
> `[a-e]` | The characters 'a' through 'e' inclusive, in Unicode code point order
> `[\u4E01]` | The character U+4E01
> `[a{ab}{ac}]` | The character 'a' and the multicharacter strings "ab" and "ac"
> `[\p{Lu}]` | All characters in the general category Uppercase Letter

Any character may be preceded by a backslash in order to remove any special meaning. White space characters, as defined by UCharacter.isWhitespace(), are ignored, unless they are escaped.

Property patterns specify a set of characters having a certain property as defined by the Unicode standard. Both the POSIX-like "[:Lu:]" and the Perl-like syntax "\\p{Lu}" are recognized. For a complete list of supported property patterns, see the User's Guide for UnicodeSet at http://icu-project.org/userguide/unicodeSet.html. Actual determination of property data is defined by the underlying Unicode database as implemented by UCharacter.

Patterns specify individual characters, ranges of characters, and Unicode property sets. When elements are concatenated, they specify their union. To complement a set, place a '^' immediately after the opening '['. Property patterns are inverted by modifying their delimiters; "[:^foo]" and "\\P{foo}". In any other location, '^' has no special meaning.

Ranges are indicated by placing two a '-' between two characters, as in "a-z". This specifies the range of all characters from the left to the right, in Unicode order. If the left character is greater than or equal to the right character it is a syntax error. If a '-' occurs as the first character after the opening '[' or '[^', or if it occurs as the last character before the closing ']', then it is taken as a literal. Thus "[a\-b]", "[-ab]", and "[ab-]" all indicate the same set of three characters, 'a', 'b', and '-'.

Sets may be intersected using the '&' operator or the asymmetric set difference may be taken using the '-' operator, for example, "[[:L:]&[\\u0000-\\u0FFF]]" indicates the set of all Unicode letters with values less than 4096. Operators ('&' and '|') have equal precedence and bind left-to-right. Thus "[[:L:]-[a-z]-[\\u0100-\\u01FF]]" is equivalent to "[[[:L:]-[a-z]]-[\\u0100-\\u01FF]]". This only really matters for difference; intersection is commutative.

`[a]` | The set containing 'a'
`[a-z]` | The set containing 'a' through 'z' and all letters in between, in Unicode order
`[^a-z]` | The set containing all characters but 'a' through 'z', that is, U+0000 through 'a'-1 and 'z'+1 through U+10FFFF
`[[pat1][pat2]]` | The union of sets specified by pat1 and pat2
`[[pat1]&[pat2]]` | The intersection of sets specified by pat1 and pat2
`[[pat1]-[pat2]]` | The asymmetric difference of sets specified by pat1 and pat2
`[:Lu:] or \p{Lu}` | The set of characters having the specified Unicode property; in this case, Unicode uppercase letters
`[:^Lu:] or \P{Lu}` | The set of characters not having the given Unicode property

Warning: you cannot add an empty string ("") to a UnicodeSet.

Formal syntax

> `pattern :=` | `('[' '^'? item* ']') | property`
> `item :=` | `char | (char '-' char) | pattern-expr`
> `pattern-expr :=` | `pattern | pattern-expr pattern | pattern-expr op pattern`
> `op :=` | `'&' | '-'`
> `special :=` | `'[' | ']' | '-'`
> `char :=` | any character that is not `special | ('\'` any character`) | ('\u' hex hex hex hex)`
> `hex :=` | any character for which `Character.digit(c, 16)` returns a non-negative result
> `property :=` | a Unicode property set pattern

> Legend:
> `a := b` |  | `a` may be replaced by `b`
> `a?` |  | zero or one instance of `a`
> `a*` |  | one or more instances of `a`
> `a | b` |  | either `a` or `b`
> `'a'` |  | the literal string between the quotes

Note:

- Most UnicodeSet methods do not take a UErrorCode parameter because there are usually very few opportunities for failure other than a shortage of memory, error codes in low-level C++ string methods would be inconvenient, and the error code as the last parameter (ICU convention) would prevent the use of default parameter values. Instead, such methods set the UnicodeSet into a "bogus" state (see isBogus()) if an error occurs.

Author:
  Alan Liu

Stable:
  ICU 2.0

Definition at line 272 of file uniset.h.

## Member Enumeration Documentation

anonymous enum

Enumerator:

  MIN_VALUE | Minimum value that can be stored in a UnicodeSet. Stable: ICU 2.4
  MAX_VALUE | Maximum value that can be stored in a UnicodeSet. Stable: ICU 2.4

Definition at line 332 of file uniset.h.

## Constructor & Destructor Documentation

UnicodeSet::UnicodeSet | ( |  | ) |

Constructs an empty set.

Stable:
  ICU 2.0

UnicodeSet::UnicodeSet | ( | UChar32 | start,
|  | UChar32 | end |
| ) |  |  |

Constructs a set containing the given range.

If `end > start` then an empty set is created.

Parameters:

  | start | first character, inclusive, of range
  | end | last character, inclusive, of range

Stable:
  ICU 2.4

UnicodeSet::UnicodeSet | ( | const UnicodeString & | pattern,
|  | UErrorCode & | status |
| ) |  |  |

Constructs a set from the given pattern.

See the class description for the syntax of the pattern language.

Parameters:

  | pattern | a string specifying what characters are in the set
  | status | returns `U_ILLEGAL_ARGUMENT_ERROR` if the pattern contains a syntax error.

Stable:
  ICU 2.0

UnicodeSet::UnicodeSet | ( | const UnicodeString & | pattern,
|  | uint32_t | options,
|  | const SymbolTable * | symbols,
|  | UErrorCode & | status |
| ) |  |  |

Constructs a set from the given pattern.

See the class description for the syntax of the pattern language.

Parameters:

  | pattern | a string specifying what characters are in the set
  | options | bitmask for options to apply to the pattern. Valid options are USET_IGNORE_SPACE and USET_CASE_INSENSITIVE.
  | symbols | a symbol table mapping variable names to values and stand-in characters to UnicodeSets; may be NULL
  | status | returns `U_ILLEGAL_ARGUMENT_ERROR` if the pattern contains a syntax error.

Internal:
  Do not use. This API is for internal use only.

UnicodeSet::UnicodeSet | ( | const UnicodeString & | pattern,
|  | ParsePosition & | pos,
|  | uint32_t | options,
|  | const SymbolTable * | symbols,
|  | UErrorCode & | status |
| ) |  |  |

Constructs a set from the given pattern.

See the class description for the syntax of the pattern language.

Parameters:

  | pattern | a string specifying what characters are in the set
  | pos | on input, the position in pattern at which to start parsing. On output, the position after the last character parsed.
  | options | bitmask for options to apply to the pattern. Valid options are USET_IGNORE_SPACE and USET_CASE_INSENSITIVE.
  | symbols | a symbol table mapping variable names to values and stand-in characters to UnicodeSets; may be NULL
  | status | input-output error code

Stable:
  ICU 2.8

UnicodeSet::UnicodeSet | ( | const UnicodeSet & | o | ) |

Constructs a set that is identical to the given UnicodeSet.

Stable:
  ICU 2.0

virtual UnicodeSet::~UnicodeSet | ( |  | ) | `[virtual]`

Destructs the set.

Stable:
  ICU 2.0

## Member Function Documentation

UnicodeSet& UnicodeSet::add | ( | const UnicodeString & | s | ) |

Adds the specified multicharacter to this set if it is not already present.

If this set already contains the multicharacter, the call leaves this set unchanged. Thus "ch" => {"ch"}
Warning: you cannot add an empty string ("") to a UnicodeSet. A frozen set will not be modified.

Parameters:

  | s | the source string

Returns:
  this object, for chaining

Stable:
  ICU 2.4

UnicodeSet& UnicodeSet::add | ( | UChar32 | c | ) |

Adds the specified character to this set if it is not already present.

If this set already contains the specified character, the call leaves this set unchanged. A frozen set will not be modified.

Stable:
  ICU 2.0

virtual UnicodeSet& UnicodeSet::add | ( | UChar32 | start,
|  | UChar32 | end |
| ) |  |  | `[virtual]`

Adds the specified range to this set if it is not already present.

If this set already contains the specified range, the call leaves this set unchanged. If `end > start` then an empty range is added, leaving the set unchanged. This is equivalent to a boolean logic OR, or a set UNION. A frozen set will not be modified.

Parameters:

  | start | first character, inclusive, of range to be added to this set.
  | end | last character, inclusive, of range to be added to this set.

Stable:
  ICU 2.0

virtual UnicodeSet& UnicodeSet::addAll | ( | const UnicodeSet & | c | ) | `[virtual]`

Adds all of the elements in the specified set to this set if they're not already present.

This operation effectively modifies this set so that its value is the union of the two sets. The behavior of this operation is unspecified if the specified collection is modified while the operation is in progress. A frozen set will not be modified.

Parameters:

  | c | set whose elements are to be added to this set.

See also:
  add(UChar32, UChar32)

Stable:
  ICU 2.0

UnicodeSet& UnicodeSet::addAll | ( | const UnicodeString & | s | ) |

Adds each of the characters in this string to the set.

Thus "ch" => {"c", "h"} If this set already any particular character, it has no effect on that character. A frozen set will not be modified.

Parameters:

  | s | the source string

Returns:
  this object, for chaining

Stable:
  ICU 2.4

virtual void UnicodeSet::addMatchSetTo | ( | UnicodeSet & | toUnionTo | ) | const`[virtual]`

Implementation of UnicodeMatcher API.

Union the set of all characters that may be matched by this object into the given set.

Parameters:

  | toUnionTo | the set into which to union the source characters

Stable:
  ICU 2.4

UnicodeSet& UnicodeSet::applyIntPropertyValue | ( | UProperty | prop,
|  | int32_t | value,
|  | UErrorCode & | ec |
| ) |  |  |

Modifies this set to contain those code points which have the given value for the given binary or enumerated property, as returned by u_getIntPropertyValue.

Prior contents of this set are lost. A frozen set will not be modified.

Parameters:

  | prop | a property in the range UCHAR_BIN_START..UCHAR_BIN_LIMIT-1 or UCHAR_INT_START..UCHAR_INT_LIMIT-1 or UCHAR_MASK_START..UCHAR_MASK_LIMIT-1.
  | value | a value in the range u_getIntPropertyMinValue(prop).. u_getIntPropertyMaxValue(prop), with one exception. If prop is UCHAR_GENERAL_CATEGORY_MASK, then value should not be a UCharCategory, but rather a mask value produced by U_GET_GC_MASK(). This allows grouped categories such as [:L:] to be represented.
  | ec | error code input/output parameter

Returns:
  a reference to this set

Stable:
  ICU 2.4

UnicodeSet& UnicodeSet::applyPattern | ( | const UnicodeString & | pattern,
|  | ParsePosition & | pos,
|  | uint32_t | options,
|  | const SymbolTable * | symbols,
|  | UErrorCode & | status |
| ) |  |  |

Parses the given pattern, starting at the given position.

The character at pattern.charAt(pos.getIndex()) must be '[', or the parse fails. Parsing continues until the corresponding closing ']'. If a syntax error is encountered between the opening and closing brace, the parse fails. Upon return from a successful parse, the ParsePosition is updated to point to the character following the closing ']', and a StringBuffer containing a pairs list for the parsed pattern is returned. This method calls itself recursively to parse embedded subpatterns. Empties the set passed before applying the pattern. A frozen set will not be modified.

Parameters:

  | pattern | the string containing the pattern to be parsed. The portion of the string from pos.getIndex(), which must be a '[', to the corresponding closing ']', is parsed.
  | pos | upon entry, the position at which to being parsing. The character at pattern.charAt(pos.getIndex()) must be a '['. Upon return from a successful parse, pos.getIndex() is either the character after the closing ']' of the parsed pattern, or pattern.length() if the closing ']' is the last character of the pattern string.
  | options | bitmask for options to apply to the pattern. Valid options are USET_IGNORE_SPACE and USET_CASE_INSENSITIVE.
  | symbols | a symbol table mapping variable names to values and stand-ins to UnicodeSets; may be NULL
  | status | returns `U_ILLEGAL_ARGUMENT_ERROR` if the pattern contains a syntax error.

Returns:
  a reference to this

Stable:
  ICU 2.8

UnicodeSet& UnicodeSet::applyPattern | ( | const UnicodeString & | pattern,
|  | uint32_t | options,
|  | const SymbolTable * | symbols,
|  | UErrorCode & | status |
| ) |  |  |

Modifies this set to represent the set specified by the given pattern, optionally ignoring white space.

See the class description for the syntax of the pattern language. A frozen set will not be modified.

Parameters:

  | pattern | a string specifying what characters are in the set
  | options | bitmask for options to apply to the pattern. Valid options are USET_IGNORE_SPACE and USET_CASE_INSENSITIVE.
  | symbols | a symbol table mapping variable names to values and stand-ins to UnicodeSets; may be NULL
  | status | returns `U_ILLEGAL_ARGUMENT_ERROR` if the pattern contains a syntax error. Empties the set passed before applying the pattern.

Returns:
  a reference to this

Internal:
  Do not use. This API is for internal use only.

UnicodeSet& UnicodeSet::applyPattern | ( | const UnicodeString & | pattern,
|  | UErrorCode & | status |
| ) |  |  |

Modifies this set to represent the set specified by the given pattern, optionally ignoring white space.

See the class description for the syntax of the pattern language. A frozen set will not be modified.

Parameters:

  | pattern | a string specifying what characters are in the set
  | status | returns `U_ILLEGAL_ARGUMENT_ERROR` if the pattern contains a syntax error. Empties the set passed before applying the pattern.

Returns:
  a reference to this

Stable:
  ICU 2.0

UnicodeSet& UnicodeSet::applyPropertyAlias | ( | const UnicodeString & | prop,
|  | const UnicodeString & | value,
|  | UErrorCode & | ec |
| ) |  |  |

Modifies this set to contain those code points which have the given value for the given property.

Prior contents of this set are lost. A frozen set will not be modified.

Parameters:

  | prop | a property alias, either short or long. The name is matched loosely. See PropertyAliases.txt for names and a description of loose matching. If the value string is empty, then this string is interpreted as either a General_Category value alias, a Script value alias, a binary property alias, or a special ID. Special IDs are matched loosely and correspond to the following sets:

"ANY" = [\u0000-\U0010FFFF], "ASCII" = [\u0000-\u007F], "Assigned" = [:^Cn:].

Parameters:

  | value | a value alias, either short or long. The name is matched loosely. See PropertyValueAliases.txt for names and a description of loose matching. In addition to aliases listed, numeric values and canonical combining classes may be expressed numerically, e.g., ("nv", "0.5") or ("ccc", "220"). The value string may also be empty.
  | ec | error code input/output parameter

Returns:
  a reference to this set

Stable:
  ICU 2.4

UChar32 UnicodeSet::charAt | ( | int32_t | index | ) | const

Returns the character at the given index within this set, where the set is ordered by ascending code point.

If the index is out of range, return (UChar32)-1. The inverse of this method is `indexOf()`.

Parameters:

  | index | an index from 0..size()-1

Returns:
  the character at the given index, or (UChar32)-1.

Stable:
  ICU 2.4

virtual UnicodeSet& UnicodeSet::clear | ( | void |  | ) | `[virtual]`

Removes all of the elements from this set.

This set will be empty after this call returns. A frozen set will not be modified.

Stable:
  ICU 2.0

virtual UnicodeFunctor* UnicodeSet::clone | ( |  | ) | const`[virtual]`

Returns a copy of this object.

All UnicodeFunctor objects have to support cloning in order to allow classes using UnicodeFunctors, such as Transliterator, to implement cloning. If this set is frozen, then the clone will be frozen as well. Use cloneAsThawed() for a mutable clone of a frozen set.

See also:
  cloneAsThawed

Stable:
  ICU 2.0

Implements UnicodeFunctor.

UnicodeFunctor* UnicodeSet::cloneAsThawed | ( |  | ) | const

Clone the set and make the clone mutable.

See the ICU4J Freezable interface for details.

Returns:
  the mutable clone

See also:
  freeze
  isFrozen

Stable:
  ICU 3.8

UnicodeSet& UnicodeSet::closeOver | ( | int32_t | attribute | ) |

Close this set over the given attribute.

For the attribute USET_CASE, the result is to modify this set so that:

1. For each character or string 'a' in this set, all strings or characters 'b' such that foldCase(a) == foldCase(b) are added to this set.

2. For each string 'e' in the resulting set, if e != foldCase(e), 'e' will be removed.

Example: [aq\u00DF{Bc}{bC}{Fi}] => [aAqQ\u00DF\uFB01{ss}{bc}{fi}]

(Here foldCase(x) refers to the operation u_strFoldCase, and a == b denotes that the contents are the same, not pointer comparison.)

A frozen set will not be modified.

Parameters:

  | attribute | bitmask for attributes to close over. Currently only the USET_CASE bit is supported. Any undefined bits are ignored.

Returns:
  a reference to this set.

Stable:
  ICU 4.2

virtual UnicodeSet& UnicodeSet::compact | ( |  | ) | `[virtual]`

Reallocate this objects internal structures to take up the least possible space, without changing this object's value.

A frozen set will not be modified.

Stable:
  ICU 2.4

UnicodeSet& UnicodeSet::complement | ( | const UnicodeString & | s | ) |

Complement the specified string in this set.

The set will not contain the specified string once the call returns.
Warning: you cannot add an empty string ("") to a UnicodeSet. A frozen set will not be modified.

Parameters:

  | s | the string to complement

Returns:
  this object, for chaining

Stable:
  ICU 2.4

UnicodeSet& UnicodeSet::complement | ( | UChar32 | c | ) |

Complements the specified character in this set.

The character will be removed if it is in this set, or will be added if it is not in this set. A frozen set will not be modified.

Stable:
  ICU 2.0

virtual UnicodeSet& UnicodeSet::complement | ( | UChar32 | start,
|  | UChar32 | end |
| ) |  |  | `[virtual]`

Complements the specified range in this set.

Any character in the range will be removed if it is in this set, or will be added if it is not in this set. If `end > start` then an empty range is complemented, leaving the set unchanged. This is equivalent to a boolean logic XOR. A frozen set will not be modified.

Parameters:

  | start | first character, inclusive, of range to be removed from this set.
  | end | last character, inclusive, of range to be removed from this set.

Stable:
  ICU 2.0

virtual UnicodeSet& UnicodeSet::complement | ( | void |  | ) | `[virtual]`

Inverts this set.

This operation modifies this set so that its value is its complement. This is equivalent to `complement(MIN_VALUE, MAX_VALUE)`. A frozen set will not be modified.

Stable:
  ICU 2.0

virtual UnicodeSet& UnicodeSet::complementAll | ( | const UnicodeSet & | c | ) | `[virtual]`

Complements in this set all elements contained in the specified set.

Any character in the other set will be removed if it is in this set, or will be added if it is not in this set. A frozen set will not be modified.

Parameters:

  | c | set that defines which elements will be xor'ed from this set.

Stable:
  ICU 2.4

UnicodeSet& UnicodeSet::complementAll | ( | const UnicodeString & | s | ) |

Complement EACH of the characters in this string.

Note: "ch" == {"c", "h"} If this set already any particular character, it has no effect on that character. A frozen set will not be modified.

Parameters:

  | s | the source string

Returns:
  this object, for chaining

Stable:
  ICU 2.4

UBool UnicodeSet::contains | ( | const UnicodeString & | s | ) | const

Returns `true` if this set contains the given multicharacter string.

Parameters:

  | s | string to be checked for containment

Returns:
  `true` if this set contains the specified string

Stable:
  ICU 2.4

virtual UBool UnicodeSet::contains | ( | UChar32 | start,
|  | UChar32 | end |
| ) |  |  | const`[virtual]`

Returns true if this set contains every character of the given range.

Parameters:

  | start | first character, inclusive, of the range
  | end | last character, inclusive, of the range

Returns:
  true if the test condition is met

Stable:
  ICU 2.0

virtual UBool UnicodeSet::contains | ( | UChar32 | c | ) | const`[virtual]`

Returns true if this set contains the given character.

This function works faster with a frozen set.

Parameters:

  | c | character to be checked for containment

Returns:
  true if the test condition is met

Stable:
  ICU 2.0

Implements UnicodeFilter.

UBool UnicodeSet::containsAll | ( | const UnicodeString & | s | ) | const

Returns true if this set contains all the characters of the given string.

Parameters:

  | s | string containing characters to be checked for containment

Returns:
  true if the test condition is met

Stable:
  ICU 2.4

virtual UBool UnicodeSet::containsAll | ( | const UnicodeSet & | c | ) | const`[virtual]`

Returns true if this set contains all the characters and strings of the given set.

Parameters:

  | c | set to be checked for containment

Returns:
  true if the test condition is met

Stable:
  ICU 2.4

UBool UnicodeSet::containsNone | ( | const UnicodeString & | s | ) | const

Returns true if this set contains none of the characters of the given string.

Parameters:

  | s | string containing characters to be checked for containment

Returns:
  true if the test condition is met

Stable:
  ICU 2.4

UBool UnicodeSet::containsNone | ( | const UnicodeSet & | c | ) | const

Returns true if this set contains none of the characters and strings of the given set.

Parameters:

  | c | set to be checked for containment

Returns:
  true if the test condition is met

Stable:
  ICU 2.4

UBool UnicodeSet::containsNone | ( | UChar32 | start,
|  | UChar32 | end |
| ) |  |  | const

Returns true if this set contains none of the characters of the given range.

Parameters:

  | start | first character, inclusive, of the range
  | end | last character, inclusive, of the range

Returns:
  true if the test condition is met

Stable:
  ICU 2.4

Referenced by containsSome().

UBool UnicodeSet::containsSome | ( | const UnicodeString & | s | ) | const`[inline]`

Returns true if this set contains one or more of the characters of the given string.

Parameters:

  | s | string containing characters to be checked for containment

Returns:
  true if the condition is met

Stable:
  ICU 2.4

Definition at line 1627 of file uniset.h.

References containsNone().

UBool UnicodeSet::containsSome | ( | const UnicodeSet & | s | ) | const`[inline]`

Returns true if this set contains one or more of the characters and strings of the given set.

Parameters:

  | s | The set to be checked for containment

Returns:
  true if the condition is met

Stable:
  ICU 2.4

Definition at line 1623 of file uniset.h.

References containsNone().

UBool UnicodeSet::containsSome | ( | UChar32 | start,
|  | UChar32 | end |
| ) |  |  | const`[inline]`

Returns true if this set contains one or more of the characters in the given range.

Parameters:

  | start | first character, inclusive, of the range
  | end | last character, inclusive, of the range

Returns:
  true if the condition is met

Stable:
  ICU 2.4

Definition at line 1619 of file uniset.h.

References containsNone().

static UnicodeSet* UnicodeSet::createFrom | ( | const UnicodeString & | s | ) | `[static]`

Makes a set from a multicharacter string.

Thus "ch" => {"ch"}
Warning: you cannot add an empty string ("") to a UnicodeSet.

Parameters:

  | s | the source string

Returns:
  a newly created set containing the given string. The caller owns the return object and is responsible for deleting it.

Stable:
  ICU 2.4

static UnicodeSet* UnicodeSet::createFromAll | ( | const UnicodeString & | s | ) | `[static]`

Makes a set from each of the characters in the string.

Thus "ch" => {"c", "h"}

Parameters:

  | s | the source string

Returns:
  a newly created set containing the given characters The caller owns the return object and is responsible for deleting it.

Stable:
  ICU 2.4

UnicodeFunctor* UnicodeSet::freeze | ( |  | ) |

Freeze the set (make it immutable).

Once frozen, it cannot be unfrozen and is therefore thread-safe until it is deleted. See the ICU4J Freezable interface for details. Freezing the set may also make some operations faster, for example contains() and span(). A frozen set will not be modified. (It remains frozen.)

Returns:
  this set.

See also:
  isFrozen
  cloneAsThawed

Stable:
  ICU 3.8

const UnicodeSet * UnicodeSet::fromUSet | ( | const USet * | uset | ) | `[inline, static]`

Get a UnicodeSet pointer from a const USet.

Parameters:

  | uset | a const USet (the ICU plain C type for UnicodeSet)

Returns:
  the corresponding UnicodeSet pointer.

Stable:
  ICU 4.2

Definition at line 1639 of file uniset.h.

UnicodeSet * UnicodeSet::fromUSet | ( | USet * | uset | ) | `[inline, static]`

Get a UnicodeSet pointer from a USet.

Parameters:

  | uset | a USet (the ICU plain C type for UnicodeSet)

Returns:
  the corresponding UnicodeSet pointer.

Stable:
  ICU 4.2

Definition at line 1635 of file uniset.h.

virtual UClassID UnicodeSet::getDynamicClassID | ( | void |  | ) | const`[virtual]`

Implement UnicodeFunctor API.

Returns:
  The class ID for this object. All objects of a given class have the same class ID. Objects of other classes have different class IDs.

Stable:
  ICU 2.4

Implements UnicodeFilter.

virtual int32_t UnicodeSet::getRangeCount | ( | void |  | ) | const`[virtual]`

Iteration method that returns the number of ranges contained in this set.

See also:
  getRangeStart
  getRangeEnd

Stable:
  ICU 2.4

virtual UChar32 UnicodeSet::getRangeEnd | ( | int32_t | index | ) | const`[virtual]`

Iteration method that returns the last character in the specified range of this set.

See also:
  getRangeStart
  getRangeEnd

Stable:
  ICU 2.4

virtual UChar32 UnicodeSet::getRangeStart | ( | int32_t | index | ) | const`[virtual]`

Iteration method that returns the first character in the specified range of this set.

See also:
  getRangeCount
  getRangeEnd

Stable:
  ICU 2.4

static UClassID UnicodeSet::getStaticClassID | ( | void |  | ) | `[static]`

Return the class ID for this class.

This is useful only for comparing to a return value from getDynamicClassID(). For example:

     .      Base* polymorphic_pointer = createPolymorphicObject();
     .      if (polymorphic_pointer->getDynamicClassID() ==
     .          Derived::getStaticClassID()) ...

Returns:
  The class ID for all objects of this class.

Stable:
  ICU 2.0

Reimplemented from UnicodeFilter.

virtual int32_t UnicodeSet::hashCode | ( | void |  | ) | const`[virtual]`

Returns the hash code value for this set.

Returns:
  the hash code value for this set.

See also:
  Object::hashCode()

Stable:
  ICU 2.0

int32_t UnicodeSet::indexOf | ( | UChar32 | c | ) | const

Returns the index of the given character within this set, where the set is ordered by ascending code point.

If the character is not in this set, return -1. The inverse of this method is `charAt()`.

Returns:
  an index from 0..size()-1, or -1

Stable:
  ICU 2.4

UBool UnicodeSet::isBogus | ( | void |  | ) | const`[inline]`

Determine if this object contains a valid set.

A bogus set has no value. It is different from an empty set. It can be used to indicate that no set value is available.

Returns:
  TRUE if the set is valid, FALSE otherwise

See also:
  setToBogus()

Stable:
  ICU 4.0

Definition at line 1631 of file uniset.h.

virtual UBool UnicodeSet::isEmpty | ( | void |  | ) | const`[virtual]`

Returns `true` if this set contains no elements.

Returns:
  `true` if this set contains no elements.

Stable:
  ICU 2.0

UBool UnicodeSet::isFrozen | ( |  | ) | const`[inline]`

Determines whether the set has been frozen (made immutable) or not.

See the ICU4J Freezable interface for details.

Returns:
  TRUE/FALSE for whether the set has been frozen

See also:
  freeze
  cloneAsThawed

Stable:
  ICU 3.8

Definition at line 1615 of file uniset.h.

References NULL.

virtual UMatchDegree UnicodeSet::matches | ( | const Replaceable & | text,
|  | int32_t & | offset,
|  | int32_t | limit,
|  | UBool | incremental |
| ) |  |  | `[virtual]`

Implement UnicodeMatcher::matches().

Stable:
  ICU 2.4

Reimplemented from UnicodeFilter.

UBool UnicodeSet::operator!= | ( | const UnicodeSet & | o | ) | const`[inline]`

Compares the specified object with this set for equality.

Returns `true` if the specified set is not equal to this set.

Stable:
  ICU 2.0

Definition at line 1611 of file uniset.h.

References operator==().

UnicodeSet& UnicodeSet::operator= | ( | const UnicodeSet & | o | ) |

Assigns this object to be a copy of another.

A frozen set will not be modified.

Stable:
  ICU 2.0

virtual UBool UnicodeSet::operator== | ( | const UnicodeSet & | o | ) | const`[virtual]`

Compares the specified object with this set for equality.

Returns `true` if the two sets have the same size, and every member of the specified set is contained in this set (or equivalently, every member of this set is contained in the specified set).

Parameters:

  | o | set to be compared for equality with this set.

Returns:
  `true` if the specified set is equal to this set.

Stable:
  ICU 2.0

Referenced by operator!=().

UnicodeSet& UnicodeSet::remove | ( | const UnicodeString & | s | ) |

Removes the specified string from this set if it is present.

The set will not contain the specified character once the call returns. A frozen set will not be modified.

Parameters:

  | s | the source string

Returns:
  this object, for chaining

Stable:
  ICU 2.4

UnicodeSet& UnicodeSet::remove | ( | UChar32 | c | ) |

Removes the specified character from this set if it is present.

The set will not contain the specified range once the call returns. A frozen set will not be modified.

Stable:
  ICU 2.0

virtual UnicodeSet& UnicodeSet::remove | ( | UChar32 | start,
|  | UChar32 | end |
| ) |  |  | `[virtual]`

Removes the specified range from this set if it is present.

The set will not contain the specified range once the call returns. If `end > start` then an empty range is removed, leaving the set unchanged. A frozen set will not be modified.

Parameters:

  | start | first character, inclusive, of range to be removed from this set.
  | end | last character, inclusive, of range to be removed from this set.

Stable:
  ICU 2.0

virtual UnicodeSet& UnicodeSet::removeAll | ( | const UnicodeSet & | c | ) | `[virtual]`

Removes from this set all of its elements that are contained in the specified set.

This operation effectively modifies this set so that its value is the asymmetric set difference of the two sets. A frozen set will not be modified.

Parameters:

  | c | set that defines which elements will be removed from this set.

Stable:
  ICU 2.0

UnicodeSet& UnicodeSet::removeAll | ( | const UnicodeString & | s | ) |

Remove EACH of the characters in this string.

Note: "ch" == {"c", "h"} If this set already any particular character, it has no effect on that character. A frozen set will not be modified.

Parameters:

  | s | the source string

Returns:
  this object, for chaining

Stable:
  ICU 2.4

virtual UnicodeSet& UnicodeSet::removeAllStrings | ( |  | ) | `[virtual]`

Remove all strings from this set.

Returns:
  a reference to this set.

Stable:
  ICU 4.2

static UBool UnicodeSet::resemblesPattern | ( | const UnicodeString & | pattern,
|  | int32_t | pos |
| ) |  |  | `[static]`

Return true if the given position, in the given pattern, appears to be the start of a UnicodeSet pattern.

Stable:
  ICU 2.4

UnicodeSet& UnicodeSet::retain | ( | UChar32 | c | ) |

Retain the specified character from this set if it is present.

A frozen set will not be modified.

Stable:
  ICU 2.0

virtual UnicodeSet& UnicodeSet::retain | ( | UChar32 | start,
|  | UChar32 | end |
| ) |  |  | `[virtual]`

Retain only the elements in this set that are contained in the specified range.

If `end > start` then an empty range is retained, leaving the set empty. This is equivalent to a boolean logic AND, or a set INTERSECTION. A frozen set will not be modified.

Parameters:

  | start | first character, inclusive, of range to be retained to this set.
  | end | last character, inclusive, of range to be retained to this set.

Stable:
  ICU 2.0

virtual UnicodeSet& UnicodeSet::retainAll | ( | const UnicodeSet & | c | ) | `[virtual]`

Retains only the elements in this set that are contained in the specified set.

In other words, removes from this set all of its elements that are not contained in the specified set. This operation effectively modifies this set so that its value is the intersection of the two sets. A frozen set will not be modified.

Parameters:

  | c | set that defines which elements this set will retain.

Stable:
  ICU 2.0

UnicodeSet& UnicodeSet::retainAll | ( | const UnicodeString & | s | ) |

Retains EACH of the characters in this string.

Note: "ch" == {"c", "h"} If this set already any particular character, it has no effect on that character. A frozen set will not be modified.

Parameters:

  | s | the source string

Returns:
  this object, for chaining

Stable:
  ICU 2.4

int32_t UnicodeSet::serialize | ( | uint16_t * | dest,
|  | int32_t | destCapacity,
|  | UErrorCode & | ec |
| ) |  |  | const

Serializes this set into an array of 16-bit integers.

Serialization (currently) only records the characters in the set; multicharacter strings are ignored.

The array has following format (each line is one 16-bit integer):

length = (n+2*m) | (m!=0?0x8000:0) bmpLength = n; present if m!=0 bmp[0] bmp[1] ... bmp[n-1] supp-high[0] supp-low[0] supp-high[1] supp-low[1] ... supp-high[m-1] supp-low[m-1]

The array starts with a header. After the header are n bmp code points, then m supplementary code points. Either n or m or both may be zero. n+2*m is always <= 0x7FFF.

If there are no supplementary characters (if m==0) then the header is one 16-bit integer, 'length', with value n.

If there are supplementary characters (if m!=0) then the header is two 16-bit integers. The first, 'length', has value (n+2*m)|0x8000. The second, 'bmpLength', has value n.

After the header the code points are stored in ascending order. Supplementary code points are stored as most significant 16 bits followed by least significant 16 bits.

Parameters:

  | dest | pointer to buffer of destCapacity 16-bit integers. May be NULL only if destCapacity is zero.
  | destCapacity | size of dest, or zero. Must not be negative.
  | ec | error code. Will be set to U_INDEX_OUTOFBOUNDS_ERROR if n+2*m > 0x7FFF. Will be set to U_BUFFER_OVERFLOW_ERROR if n+2*m+(m!=0?2:1) > destCapacity.

Returns:
  the total length of the serialized format, including the header, that is, n+2*m+(m!=0?2:1), or 0 on error other than U_BUFFER_OVERFLOW_ERROR.

Stable:
  ICU 2.4

UnicodeSet& UnicodeSet::set | ( | UChar32 | start,
|  | UChar32 | end |
| ) |  |  |

Make this object represent the range `start - end`.

If `end > start` then this object is set to an an empty range. A frozen set will not be modified.

Parameters:

  | start | first character in the set, inclusive
  | end | last character in the set, inclusive

Stable:
  ICU 2.4

void UnicodeSet::setToBogus | ( |  | ) |

Make this UnicodeSet object invalid.

The string will test TRUE with isBogus().

A bogus set has no value. It is different from an empty set. It can be used to indicate that no set value is available.

This utility function is used throughout the UnicodeSet implementation to indicate that a UnicodeSet operation failed, and may be used in other functions, especially but not exclusively when such functions do not take a UErrorCode for simplicity.

See also:
  isBogus()

Stable:
  ICU 4.0

virtual int32_t UnicodeSet::size | ( | void |  | ) | const`[virtual]`

Returns the number of elements in this set (its cardinality).

Note than the elements of a set may include both individual codepoints and strings.

Returns:
  the number of elements in this set (its cardinality).

Stable:
  ICU 2.0

int32_t UnicodeSet::span | ( | const UnicodeString & | s,
|  | int32_t | start,
|  | USetSpanCondition | spanCondition |
| ) |  |  | const`[inline]`

Returns the end of the substring of the input string according to the USetSpanCondition.

Same as `start+span(s.getBuffer()+start, s.length()-start, spanCondition)` after pinning start to 0<=start<=s.length().

Parameters:

  | s | the string
  | start | the start index in the string for the span operation
  | spanCondition | specifies the containment condition

Returns:
  the exclusive end of the substring according to the spanCondition; the substring s.tempSubStringBetween(start, end) fulfills the spanCondition

Draft:
  This API may be changed in the future versions and was introduced in ICU 4.4

See also:
  USetSpanCondition

Definition at line 1651 of file uniset.h.

References UnicodeString::getBuffer(), UnicodeString::length(), and span().

int32_t UnicodeSet::span | ( | const UChar * | s,
|  | int32_t | length,
|  | USetSpanCondition | spanCondition |
| ) |  |  | const

Returns the length of the initial substring of the input string which consists only of characters and strings that are contained in this set (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE), or only of characters and strings that are not contained in this set (USET_SPAN_NOT_CONTAINED).

See USetSpanCondition for details. Similar to the strspn() C library function. Unpaired surrogates are treated according to contains() of their surrogate code points. This function works faster with a frozen set and with a non-negative string length argument.

Parameters:

  | s | start of the string
  | length | of the string; can be -1 for NUL-terminated
  | spanCondition | specifies the containment condition

Returns:
  the length of the initial substring according to the spanCondition; 0 if the start of the string does not fit the spanCondition

Stable:
  ICU 3.8

See also:
  USetSpanCondition

Referenced by span().

int32_t UnicodeSet::spanBack | ( | const UnicodeString & | s,
|  | int32_t | limit,
|  | USetSpanCondition | spanCondition |
| ) |  |  | const`[inline]`

Returns the start of the substring of the input string according to the USetSpanCondition.

Same as `spanBack(s.getBuffer(), limit, spanCondition)` after pinning limit to 0<=end<=s.length().

Parameters:

  | s | the string
  | limit | the exclusive-end index in the string for the span operation (use s.length() or INT32_MAX for spanning back from the end of the string)
  | spanCondition | specifies the containment condition

Returns:
  the start of the substring according to the spanCondition; the substring s.tempSubStringBetween(start, limit) fulfills the spanCondition

Draft:
  This API may be changed in the future versions and was introduced in ICU 4.4

See also:
  USetSpanCondition

Definition at line 1661 of file uniset.h.

References UnicodeString::getBuffer(), UnicodeString::length(), and spanBack().

int32_t UnicodeSet::spanBack | ( | const UChar * | s,
|  | int32_t | length,
|  | USetSpanCondition | spanCondition |
| ) |  |  | const

Returns the start of the trailing substring of the input string which consists only of characters and strings that are contained in this set (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE), or only of characters and strings that are not contained in this set (USET_SPAN_NOT_CONTAINED).

See USetSpanCondition for details. Unpaired surrogates are treated according to contains() of their surrogate code points. This function works faster with a frozen set and with a non-negative string length argument.

Parameters:

  | s | start of the string
  | length | of the string; can be -1 for NUL-terminated
  | spanCondition | specifies the containment condition

Returns:
  the start of the trailing substring according to the spanCondition; the string length if the end of the string does not fit the spanCondition

Stable:
  ICU 3.8

See also:
  USetSpanCondition

Referenced by spanBack().

int32_t UnicodeSet::spanBackUTF8 | ( | const char * | s,
|  | int32_t | length,
|  | USetSpanCondition | spanCondition |
| ) |  |  | const

Returns the start of the trailing substring of the input string which consists only of characters and strings that are contained in this set (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE), or only of characters and strings that are not contained in this set (USET_SPAN_NOT_CONTAINED).

See USetSpanCondition for details. Malformed byte sequences are treated according to contains(0xfffd). This function works faster with a frozen set and with a non-negative string length argument.

Parameters:

  | s | start of the string (UTF-8)
  | length | of the string; can be -1 for NUL-terminated
  | spanCondition | specifies the containment condition

Returns:
  the start of the trailing substring according to the spanCondition; the string length if the end of the string does not fit the spanCondition

Stable:
  ICU 3.8

See also:
  USetSpanCondition

int32_t UnicodeSet::spanUTF8 | ( | const char * | s,
|  | int32_t | length,
|  | USetSpanCondition | spanCondition |
| ) |  |  | const

Returns the length of the initial substring of the input string which consists only of characters and strings that are contained in this set (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE), or only of characters and strings that are not contained in this set (USET_SPAN_NOT_CONTAINED).

See USetSpanCondition for details. Similar to the strspn() C library function. Malformed byte sequences are treated according to contains(0xfffd). This function works faster with a frozen set and with a non-negative string length argument.

Parameters:

  | s | start of the string (UTF-8)
  | length | of the string; can be -1 for NUL-terminated
  | spanCondition | specifies the containment condition

Returns:
  the length of the initial substring according to the spanCondition; 0 if the start of the string does not fit the spanCondition

Stable:
  ICU 3.8

See also:
  USetSpanCondition

virtual UnicodeString& UnicodeSet::toPattern | ( | UnicodeString & | result,
|  | UBool | escapeUnprintable = `FALSE` |
| ) |  |  | const`[virtual]`

Returns a string representation of this set.

If the result of calling this function is passed to a UnicodeSet constructor, it will produce another set that is equal to this one. A frozen set will not be modified.

Parameters:

  | result | the string to receive the rules. Previous contents will be deleted.
  | escapeUnprintable | if TRUE then convert unprintable character to their hex escape representations, \uxxxx or \Uxxxxxxxx. Unprintable characters are those other than U+000A, U+0020..U+007E.

Stable:
  ICU 2.0

Implements UnicodeMatcher.

const USet * UnicodeSet::toUSet | ( |  | ) | const`[inline]`

Produce a const USet * pointer for this UnicodeSet.

USet is the plain C type for UnicodeSet

Returns:
  a const USet pointer for this UnicodeSet

Stable:
  ICU 4.2

Definition at line 1647 of file uniset.h.

USet * UnicodeSet::toUSet | ( |  | ) | `[inline]`

Produce a USet * pointer for this UnicodeSet.

USet is the plain C type for UnicodeSet

Returns:
  a USet pointer for this UnicodeSet

Stable:
  ICU 4.2

Definition at line 1643 of file uniset.h.

The documentation for this class was generated from the following file:

- uniset.h

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