RegexCapabilities (Lucene 2.4.1 API)
Keywords: org.apache.lucene.search.regex.RegexCapabilities interface

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## org.apache.lucene.search.regex
Interface RegexCapabilities

All Known Implementing Classes:
  JakartaRegexpCapabilities, JavaUtilRegexCapabilities

    public interface RegexCapabilities

Defines basic operations needed by `RegexQuery` for a regular expression implementation.

Method Summary
`void` | `compile(String pattern)` Called by the constructor of `RegexTermEnum` allowing implementations to cache a compiled version of the regular expression pattern.
`boolean` | `match(String string)`
`String` | `prefix()` A wise prefix implementation can reduce the term enumeration (and thus increase performance) of RegexQuery dramatically!

Method Detail

### compile

    void compile(String pattern)

  Called by the constructor of `RegexTermEnum` allowing implementations to cache a compiled version of the regular expression pattern.

  Parameters:
    `pattern` - regular expression pattern

### match

    boolean match(String string)

  Parameters:
    `string` -
  Returns:
    true if string matches the pattern last passed to `compile(java.lang.String)`.

### prefix

    String prefix()

  A wise prefix implementation can reduce the term enumeration (and thus increase performance) of RegexQuery dramatically!

  Returns:
    static non-regex prefix of the pattern last passed to `compile(java.lang.String)`. May return null.

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