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

 int pcre_copy_named_substring(const pcre *code,  " const char *subject, int *ovector,"  " int stringcount, const char *stringname,"  " char *buffer, int buffersize);"  int pcre16_copy_named_substring(const pcre16 *code,  " PCRE_SPTR16 subject, int *ovector,"  " int stringcount, PCRE_SPTR16 stringname,"  " PCRE_UCHAR16 *buffer, int buffersize);"  int pcre32_copy_named_substring(const pcre32 *code,  " PCRE_SPTR32 subject, int *ovector,"  " int stringcount, PCRE_SPTR32 stringname,"  " PCRE_UCHAR32 *buffer, int buffersize);" 

. .rs This is a convenience function for extracting a captured substring, identified by name, into a given buffer. The arguments are: code Pattern that was successfully matched 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 buffer Buffer to receive the string buffersize Size of buffer The yield is the length of the substring, PCRE_ERROR_NOMEMORY if the buffer was too small, 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.