id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
4309,Negative lookbehind assertion error,anonymous,John Maddock,"As soon as you include an OR-expression inside a negative lookbehind assertion, you get wrong results. Not sure if this is a bug, but I've tested this with multiple engines and I get different results.

------------------------

Regex:
(?<!foo|bar) \(

String:
test bar (

NO MATCH (expected)
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Regex:
(?<!food|bar) \(

String:
test bar (

MATCH (NOT expected)
------------------------
Regex:
(?<!fo|bar) \(

String:
test bar (

MATCH (NOT expected)
------------------------

This really makes it hard to match certain strings :(",Bugs,closed,Boost 1.43.0,regex,Boost 1.43.0,Problem,fixed,,