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       PCRE - Perl-compatible regular expressions


       #include <pcre.h>

       int pcre_exec(const pcre *code, const pcre_extra *extra,
            const char *subject, int length, int startoffset,
            int options, int *ovector, int ovecsize);


       This  function  matches  a  compiled regular expression against a given
       subject string, using a matching algorithm that is similar  to  Perl’s.
       It returns offsets to captured substrings. Its arguments are:

         code         Points to the compiled pattern
         extra        Points to an associated pcre_extra structure,
                        or is NULL
         subject      Points to the subject string
         length       Length of the subject string, in bytes
         startoffset  Offset in bytes in the subject at which to
                        start matching
         options      Option bits
         ovector      Points to a vector of ints for result offsets
         ovecsize     Number of elements in the vector (a multiple of 3)

       The options are:

         PCRE_ANCHORED          Match only at the first position
         PCRE_BSR_ANYCRLF       \R matches only CR, LF, or CRLF
         PCRE_BSR_UNICODE       \R matches all Unicode line endings
         PCRE_NEWLINE_ANY       Recognize any Unicode newline sequence
         PCRE_NEWLINE_ANYCRLF   Recognize CR, LF, & CRLF as newline sequences
         PCRE_NEWLINE_CR        Recognize CR as the only newline sequence
         PCRE_NEWLINE_CRLF      Recognize CRLF as the only newline sequence
         PCRE_NEWLINE_LF        Recognize LF as the only newline sequence
         PCRE_NOTBOL            Subject string is not the beginning of a line
         PCRE_NOTEOL            Subject string is not the end of a line
         PCRE_NOTEMPTY          An empty string is not a valid match
         PCRE_NOTEMPTY_ATSTART  An empty string at the start of the subject
                                  is not a valid match
         PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations
         PCRE_NO_UTF8_CHECK     Do not check the subject for UTF-8
                                  validity (only relevant if PCRE_UTF8
                                  was set at compile time)
         PCRE_PARTIAL           ) Return PCRE_ERROR_PARTIAL for a partial
         PCRE_PARTIAL_SOFT      )   match if no full matches are found
         PCRE_PARTIAL_HARD      Return PCRE_ERROR_PARTIAL for a partial match
                                  even if there is a full match as well

       For details of partial matching, see the pcrepartial page. A pcre_extra
       structure contains the following fields:

         flags        Bits indicating which fields are set
         study_data   Opaque data from pcre_study()
         match_limit  Limit on internal resource use
         match_limit_recursion  Limit on internal recursion depth
         callout_data Opaque data passed back to callouts
         tables       Points to character tables or is NULL

       The  flag  bits  are   PCRE_EXTRA_STUDY_DATA,   PCRE_EXTRA_MATCH_LIMIT,

       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.