Cached version of the matched groups in this matcher's string.
Return the list of lists of subgroups of matches.
Call the specified function for each match with each match and the list of all matched groups, then with any remaining data to the end of the string.
Map the specified function over the matches.
A Full Box containing the substring of this REMatcher's string containing the matches for the specified pattern, or Empty if no match exists.
Matches for the pattern in the specified string.
the String in which to perform pattern matching