Re: [boost] [Review] xpressive

From: Eric Niebler (eric_at_[hidden])
Date: 2005-09-19 11:06:27

Caleb Epstein wrote:
> On 9/16/05, Darren Cook <darren_at_[hidden]> wrote:
> 
>>>>~_ln which matches any one character that is not a line separator.
>>
>>_ln sounds useful. Is that in perl/PCRE ?
> 
> Its not in Perl 5.
> 

It's inspired from Perl 6. See the table at the bottom of:
http://www.perl.com/pub/a/2002/06/04/apo5.html?page=7

Perl 5:    \r?\n
Perl 6:    \n
Meaning:   asserts logical newline

Perl 5:    [^\n]
Perl 6:    \N
Meaning:   not a logical newline

For Perl 6, \n really means \r?\n. I liked that idea, but it's not as 
general as it could be. Also, it could be slow. So I broke it in two: _n 
== literal newline and _ln == logical newline, where the line separators 
are determined by the regex traits type.

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com