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       PCRE - Perl-compatible regular expressions


       #include <pcre.h>

       int pcre_get_named_substring(const pcre *code,
            const char *subject, int *ovector,
            int stringcount, const char *stringname,
            const char **stringptr);


       This  is  a convenience function for extracting a captured substring by
       name. The arguments are:

         code          Compiled pattern
         subject       Subject that has been successfully matched
         ovector       Offset vector that pcre_exec() used
         stringcount   Value returned by pcre_exec()
         stringname    Name of the required substring
         stringptr     Where to put the string pointer

       The memory in which the substring is  placed  is  obtained  by  calling
       pcre_malloc().  The  convenience  function pcre_free_substring() can be
       used to free it when it is no longer needed. The yield of the  function
       is  the  length  of  the  extracted  substring,  PCRE_ERROR_NOMEMORY if
       sufficient memory could not be obtained, or  PCRE_ERROR_NOSUBSTRING  if
       the string name is invalid.

       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.