[Boost-users] Regex Submatch Position Question

Hi all, Quick question about the Boost::Regex library. Is there a way to identify, with sub-matches, where a match in the search string is made and the length of the match? For instance, with the following regular expression and search string: Regex ==> "(\d+)" Search String ==> "Give me 100 dollars or give me 2001 dollars." Is there a way to determine that the subexpression matched at positions 8 and 31 in the search string, and that the lengths of the matches were three and four characters? Thanks