pcre_fullinfo specification

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SYNOPSIS

#include <pcre.h>

int pcre_fullinfo(const pcre *code, const pcre_extra *extra, int what, void *where);

DESCRIPTION

This function returns information about a compiled pattern. Its arguments are:

      code    Compiled regular expression
      extra   Result of pcre_study() or NULL
      what    What information is required
      where   Where to put the information

The following information is available:

      PCRE_INFO_BACKREFMAX     Number of highest back reference
      PCRE_INFO_CAPTURECOUNT   Number of capturing subpatterns
      PCRE_INFO_FIRSTBYTE      Fixed first byte for a match, or
                                 -1 for start of string
                                    or after newline, or
                                 -2 otherwise
      PCRE_INFO_FIRSTTABLE     Table of first bytes
                                 (after studying)
      PCRE_INFO_LASTLITERAL    Literal last byte required
      PCRE_INFO_NAMECOUNT      Number of named subpatterns
      PCRE_INFO_NAMEENTRYSIZE  Size of name table entry
      PCRE_INFO_NAMETABLE      Pointer to name table
      PCRE_INFO_OPTIONS        Options used for compilation
      PCRE_INFO_SIZE           Size of compiled pattern

The yield of the function is zero on success or:

      PCRE_ERROR_NULL       the argument code was NULL
                            the argument where was NULL
      PCRE_ERROR_BADMAGIC   the "magic number" was not found
      PCRE_ERROR_BADOPTION  the value of what was invalid

There is a complete description of the PCRE API in the pcreapi page.