[Boost-bugs] [Boost C++ Libraries] #4309: Negative lookbehind assertion error

Subject: [Boost-bugs] [Boost C++ Libraries] #4309: Negative lookbehind assertion error
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-06-07 23:26:08

#4309: Negative lookbehind assertion error
--------------------------+-------------------------------------------------
 Reporter:  anonymous     |       Owner:  johnmaddock
     Type:  Bugs          |      Status:  new        
Milestone:  Boost 1.43.0  |   Component:  regex      
  Version:  Boost 1.43.0  |    Severity:  Problem    
 Keywords:                |  
--------------------------+-------------------------------------------------
 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)
 ------------------------
 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 :(

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/4309>
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