the position cannot be fetched, start_pos and end_pos are left unchanged
MatchInfo.fetchPos
bool fetchPos(int matchNum, out int startPos, out int endPos)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 [glib.regex.Regex.matchAll] or [glib.regex.Regex.matchAllFull], 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.
Parameters
matchNum | number of the sub expression |
startPos | pointer to location where to store the start position, or null |
endPos | pointer to location where to store the end position, or null |
Returns
true if the position was fetched, false otherwise. If