[Boost-users] question on boost::regex expression(query);

Hi, I'm new to boost and not all that familiar with Perl regex. However, I have my own code for using Perl regex libraries for finding interesting features in DNA ( http://www.mail-archive.com/bio_bulletin_board@bioinformatics.org/msg01382.h... ) I recently added boost to work along with Microsoft's greta code. However, I now have a problem with regex exploding. The questionable regex is presumably, (?<=GU.*?TACTAAC.{20,40}AG|^).*?(?=GU.*?TACTAAC.{20,40}AG|$) ( which doesn't explode with greta AFAIK) and the code in question is ( MM_MARK is debug macro, es is error stream other stuff omitted). try { es<http://club.live.com/red_carpet_reveal.aspx?icid=redcarpet_hotmailtextlink2