Re: [Boost-users] [regex] Why pattern anchored at buffer end ($) alsomatch for (\x0c)FF, (\x0d)CR

From: Chandan Nilange (chandan_nilange_at_[hidden])
Date: 2007-09-03 03:45:58

Hello John,

I not very clear. 

So do you mean that - 

$ & ^ matching pattern after/before any  (\x0c)FF,
(\x0d)CR is right PCRE /m modifier behaviour.

Regards,
Chandan

--- John Maddock <john_at_[hidden]> wrote:

> Chandan Nilange wrote:
> >> Hello,
> >>
> >>  As per PCRE /m modifier $ will match the pattern
> before any newline.
> >>  However boost_regex gives back matches before
> formfeed(\x0c) &
> >>  CarriagReturn(\x0d) Same is observed for ^ i.e
> match after newline.
> 
> Yes, it regards any "vertical whitespace" as being
> suitable for a $ or ^ 
> match: however if you have a \r\n sequence, then it
> will *not* match in the 
> middle of that sequence.
> 
> I do recall extending the list of characters that
> will form a line boundary 
> recently, but not whether it was for Perl or Unicode
> compatibility :-(
> 
> Ah, here we are:
>
http://unicode.org/unicode/reports/tr18/#Line_Boundaries,
> 
> remember that all the sequences given really do
> indicate a line boundary in 
> most cases.
> 
> John. 
> 
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> 

       
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