From a262f2832765401ccca672aaac7a25b977fc8a20 Mon Sep 17 00:00:00 2001
From: John Maddock
Captures are the iterator ranges that are "captured" by marked sub-expressions + as a regular expression gets matched. Each marked sub-expression can + result in more than one capture, if it is matched more than once. This + document explains how captures and marked sub-expressions in Boost.Regex are + represented and accessed.
Every time a Perl regular expression contains a parenthesis group (), it spits out an extra field, known as a marked sub-expression, for example the @@ -247,4 +252,3 @@ Text: "now is the time for all good men to come to the aid of the party" or copy at http://www.boost.org/LICENSE_1_0.txt)