Re: [Boost-users] [regex] Support for right-to-left parsing?

From: John Maddock (john_at_[hidden])
Date: 2007-02-23 04:47:26

Geraint Bundy wrote:
> Hello,
>
> Does Boost::Regex support "backwards" or right-to-left parsing (like
> .NET's regex)?
>
> If not, then is it possible to emulate this behaviour using normal
> parsing?

No, I'm not really familiar with how .NET does this, every time I thought 
about adding right to left regexes, there were so many ambiguities over 
their behaviour that I gave up - the problem is that the Perl regex syntax 
is very closely tied to left-to-right parsing IMO.  You can use look-behind 
assertions of course, but that's probably not what you want?

John.