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.