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PCRE_STUDY(3)                                                    PCRE_STUDY(3)

       PCRE - Perl-compatible regular expressions


       #include <pcre.h>

       pcre_extra *pcre_study(const pcre *code, int options,
            const char **errptr);


       This function studies a compiled pattern, to see if additional information can be extracted that might speed up
       matching. Its arguments are:

         code       A compiled regular expression
         options    Options for pcre_study()
         errptr     Where to put an error message

       If the function succeeds, it returns a value that can be passed to pcre_exec()  or  pcre_dfa_exec()  via  their
       extra arguments.

       If  the  function returns NULL, either it could not find any additional information, or there was an error. You
       can tell the difference by looking at the error value. It is NULL in first case.

       The only option is PCRE_STUDY_JIT_COMPILE. It requests just-in-time compilation if possible. If PCRE  has  been
       compiled without JIT support, this option is ignored. See the pcrejit page for further details.

       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.