Re: [boost] boost regex recursive quesion

Subject: Re: [boost] boost regex recursive quesion
From: ÎÂÎ÷²¨ (wenxibo_at_[hidden])
Date: 2015-03-23 20:08:50

Hello John ,

  Thanks for your reply . 
  Does it means that all of recursive calls should be avoid in regular expression ?

  I had tried another expression "\(((?>[^()]+)|(?0))*\)" which used to check parenthesis pair .  I work well . 
  So I think boost::regex support recursive calls . 

  If it is a bug , this is a serious problem , why boost not make a caveat for it in document ?

wenxibo



> From: jz.maddock_at_[hidden]
> Date: Mon, 23 Mar 2015 17:57:46 +0000
> To: boost_at_[hidden]
> Subject: Re: [boost] boost regex recursive quesion
> 
> 
> > a(?0)?
> >
> > This regex contains a recursive call (?0).
> >
> >
> > It should match a string with any arbitrary length filled with 'a' characters.
> > regex_match only returns true for "a" and "aa", but failed to match "aaa" and any string longer than three characters.
> >
> >
> > Why?
> 
> It's a bug :(
> 
> Unfortunately the "obvious" fix breaks a heck of a lot of other stuff.
> 
> John.
> 
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