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Regex.Replace never finishes...

Last Modified: 2012-05-06
When I run the code below the Regex.Replace never finishes.  It sends my CPU up to 100% for a few minutes, never throws an exception or anything.  Just never finishes.  Any ideas what i'm doing wrong?
//string s = {up to 1000 lines of markup};
string match = @"(?:<(\w+)\b[^>]*class=""[^""]*title[^""]*""[^>]*>[\s\S]*?<\/\1|[\S\s])*?([^<\w](XXX?e?s?)[^>\w])(?![^<>\w]*>)";
string replacement = "<span class=\"withHelp\" style=\"text-decoration: underline\" title=\"XXX\">$3</span>";
    s = Regex.Replace(s, match, replacement, RegexOptions.IgnoreCase | RegexOptions.Multiline);

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