Mike Marchywka wrote:
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|$)
Variable length look-behind isn't support by Boost.Regex (or by Perl for that matter). Sorry I can't be more helpful at present: although it seems as though lookbehind isn't really needed in this case - you could remove the lookbehind and use a marked sub-expression to identify the section you want instead. So I think (?GU.*?TACTAAC.{20,40}AG|^)(.*?(?=GU.*?TACTAAC.{20,40}AG|$)) would be equivalent, with $1 containing the section you're interested in? HTH John.