Description

The template class describes a constant forward iterator object. Conceptually, it holds a regex_iterator object that it uses to search for regular expression matches in a character sequence. It extracts objects of type sub_match<BidIt> representing the submatches identified by the index values in the stored vector subs for each regular expression match.

An index value of -1 designates the character sequence beginning immediately after the end of the previous regular expression match, or beginning at the start of the character sequence if there was no previous regular expression match, and extending to but not including the first character of the current regular expression match, or to the end of the character sequence if there is no current match. Any other index value idx designates the contents of the capture group held in it.match[idx].