PCRE - Perl-compatible regular expressions .rs #include <pcre.h>

 int pcre_get_named_substring(const pcre *code,  " const char *subject, int *ovector,"  " int stringcount, const char *stringname,"  " const char **stringptr);"  int pcre16_get_named_substring(const pcre16 *code,  " PCRE_SPTR16 subject, int *ovector,"  " int stringcount, PCRE_SPTR16 stringname,"  " PCRE_SPTR16 *stringptr);"  int pcre32_get_named_substring(const pcre32 *code,  " PCRE_SPTR32 subject, int *ovector,"  " int stringcount, PCRE_SPTR32 stringname,"  " PCRE_SPTR32 *stringptr);" 

. .rs 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[16|32]_exec() used stringcount Value returned by pcre[16|32]_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[16|32]_malloc(). The convenience function pcre[16|32]_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 HREF
pcreapi
page and a description of the POSIX API in the HREF
pcreposix
page.