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

 int pcre_get_stringnumber(const pcre *code,  " const char *name);"  int pcre16_get_stringnumber(const pcre16 *code,  " PCRE_SPTR16 name);"  int pcre32_get_stringnumber(const pcre32 *code,  " PCRE_SPTR32 name);" 

. .rs This convenience function finds the number of a named substring capturing parenthesis in a compiled pattern. Its arguments are: code Compiled regular expression name Name whose number is required The yield of the function is the number of the parenthesis if the name is found, or PCRE_ERROR_NOSUBSTRING otherwise. When duplicate names are allowed (PCRE_DUPNAMES is set), it is not defined which of the numbers is returned by pcre[16|32]_get_stringnumber(). You can obtain the complete list by calling pcre[16|32]_get_stringtable_entries().

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.