NAME

       PCRE - Perl-compatible regular expressions

SYNOPSIS

       #include <pcre.h>

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

       pcre16_extra *pcre16_study(const pcre16 *code, int options,
            const char **errptr);

       pcre32_extra *pcre32_study(const pcre32 *code, int options,
            const char **errptr);

DESCRIPTION

       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[16|32]_study()
         errptr     Where to put an error message

       If  the  function  succeeds,  it  returns  a  value  that  can  be  passed   to   pcre[16|32]_exec()   or
       pcre[16|32]_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.