Re: [Boost-bugs] [Boost C++ Libraries] #7959: regex lookahead fails at about 95, 000 chars

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #7959: regex lookahead fails at about 95, 000 chars
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-02-01 09:53:22

#7959: regex lookahead fails at about 95,000 chars
---------------------------------+------------------------------------------
  Reporter:  michael@…           |       Owner:  johnmaddock
      Type:  Bugs                |      Status:  closed     
 Milestone:  To Be Determined    |   Component:  regex      
   Version:  Boost 1.52.0        |    Severity:  Problem    
Resolution:  wontfix             |    Keywords:             
---------------------------------+------------------------------------------
Changes (by johnmaddock):

  * status:  new => closed
  * resolution:  => wontfix

Comment:

 If you catch the exception you will see that it says:

 "Ran out of stack space trying to match the regular expression."

 Basically Regex sets an upper limit on how much memory it will grab when
 trying to find a match.  If you up the values of BOOST_REGEX_MAX_BLOCKS
 and/or BOOST_REGEX_BLOCKSIZE in boost/regex/user.hpp and then rebuild
 everything (including the library), then the issue will disappear - or at
 least get shifted to larger texts before you hit the limit.  Obviously if
 you set BOOST_REGEX_MAX_BLOCKS to something like INT_MAX then there is no
 limit - whether you think that's a good idea I'll leave up to you!

 But basically this is by design.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7959#comment:1>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.