NAME

       PCRE - Perl-compatible regular expressions

SYNOPSIS

       #include <pcre.h>

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

       int pcre16_fullinfo(const pcre16 *code, const pcre16_extra *extra,
            int what, void *where);

       int pcre32_fullinfo(const pcre32 *code, const pcre32_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[16|32]_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_DEFAULT_TABLES  Pointer to default tables
         PCRE_INFO_FIRSTBYTE       Fixed first data unit for a match, or
                                     -1 for start of string
                                        or after newline, or
                                     -2 otherwise
         PCRE_INFO_FIRSTTABLE      Table of first data units (after studying)
         PCRE_INFO_HASCRORLF       Return 1 if explicit CR or LF matches exist
         PCRE_INFO_JCHANGED        Return 1 if (?J) or (?-J) was used
         PCRE_INFO_JIT             Return 1 after successful JIT compilation
         PCRE_INFO_JITSIZE         Size of JIT compiled code
         PCRE_INFO_LASTLITERAL     Literal last data unit required
         PCRE_INFO_MINLENGTH       Lower bound length of matching strings
         PCRE_INFO_MATCHEMPTY      Return 1 if the pattern can match an empty string,
                                      0 otherwise
         PCRE_INFO_MATCHLIMIT      Match limit if set, otherwise PCRE_RROR_UNSET
         PCRE_INFO_MAXLOOKBEHIND   Length (in characters) of the longest lookbehind assertion
         PCRE_INFO_NAMECOUNT       Number of named subpatterns
         PCRE_INFO_NAMEENTRYSIZE   Size of name table entry
         PCRE_INFO_NAMETABLE       Pointer to name table
         PCRE_INFO_OKPARTIAL       Return 1 if partial matching can be tried
                                     (always returns 1 after release 8.00)
         PCRE_INFO_OPTIONS         Option bits used for compilation
         PCRE_INFO_SIZE            Size of compiled pattern
         PCRE_INFO_STUDYSIZE       Size of study data
         PCRE_INFO_FIRSTCHARACTER      Fixed first data unit for a match
         PCRE_INFO_FIRSTCHARACTERFLAGS Returns
                                         1 if there is a first data character set, which can
                                           then be retrieved using PCRE_INFO_FIRSTCHARACTER,
                                         2 if the first character is at the start of the data
                                           string or after a newline, and
                                         0 otherwise
         PCRE_INFO_RECURSIONLIMIT    Recursion limit if set, otherwise PCRE_ERROR_UNSET
         PCRE_INFO_REQUIREDCHAR      Literal last data unit required
         PCRE_INFO_REQUIREDCHARFLAGS Returns 1 if the last data character is set (which can then
                                     be retrieved using PCRE_INFO_REQUIREDCHAR); 0 otherwise

       The  where  argument  must  point  to  an  integer variable, except for the following what
       values:

         PCRE_INFO_DEFAULT_TABLES  const uint8_t *
         PCRE_INFO_FIRSTCHARACTER  uint32_t
         PCRE_INFO_FIRSTTABLE      const uint8_t *
         PCRE_INFO_JITSIZE         size_t
         PCRE_INFO_MATCHLIMIT      uint32_t
         PCRE_INFO_NAMETABLE       PCRE_SPTR16           (16-bit library)
         PCRE_INFO_NAMETABLE       PCRE_SPTR32           (32-bit library)
         PCRE_INFO_NAMETABLE       const unsigned char * (8-bit library)
         PCRE_INFO_OPTIONS         unsigned long int
         PCRE_INFO_SIZE            size_t
         PCRE_INFO_STUDYSIZE       size_t
         PCRE_INFO_RECURSIONLIMIT  uint32_t
         PCRE_INFO_REQUIREDCHAR    uint32_t

       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
         PCRE_ERROR_UNSET          the option was not set

       There is a complete description of  the  PCRE  native  API  in  the  pcreapi  page  and  a
       description of the POSIX API in the pcreposix page.