number of the sub expression
pointer to location where to store the start position, or NULL. out[allow-none]
pointer to location where to store the end position, or NULL. out[allow-none]
TRUE if the position was fetched, FALSE otherwise. If the position cannot be fetched, start_pos and end_pos are left unchanged
Retrieves the position in bytes of the match_num'th capturing parentheses. 0 is the full text of the match, 1 is the first paren set, 2 the second, and so on. If match_num is a valid sub pattern but it didn't match anything (e.g. sub pattern 1, matching "b" against "(a)?b") then start_pos and end_pos are set to -1 and TRUE is returned. If the match was obtained using the DFA algorithm, that is using g_regex_match_all() or g_regex_match_all_full(), the retrieved position is not that of a set of parentheses but that of a matched substring. Substrings are matched in reverse order of length, so 0 is the longest match. Since 2.14