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Re: regular expressions

• To: Liam Quin <liam@w...>
• Subject: Re: regular expressions
• From: Robin Berjon <robin.berjon@e...>
• Date: Fri, 30 Jan 2004 11:11:39 +0100
• Cc: xml-dev@l...
• In-reply-to: <20040129211933.GE13481@w...>
• References: <200401292002.i0TK2kHX080757@a...> <20040129211933.GE13481@w...>
• User-agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.6b) Gecko/20031205 Thunderbird/0.4

Liam Quin wrote:
> On Fri, Jan 30, 2004 at 12:02:46AM +0400, David Tolpin wrote:
>>Some schema languages use string regular expressions [...]
>>
>>Providing a structured syntax, similar to that for XML, would help
>>reading and debugging them, for example,
>>      local-part = "(" atoms "|" person ")"
>>      domain = "(" atoms "|" location ")"
>>      start = "(" comment " )?" local-part "@" domain "( " comment ")?"
> 
> 
> If Perl 6 ends up getting traction I think we'll see a stronger
> move for this, because Perl 6 regular expressions support an
> EBNF-style syntax and context-free (or context-sensitive) grammars
> are integrated into regular expressions.

Just getting the /x flag from Perl 5 would help a lot :) As for the Perl 
6 regexen, they are fleshed out quite completely:

   http://dev.perl.org/perl6/apocalypse/A05.html
   http://dev.perl.org/perl6/exegesis/E05.html

and I believe there are implementations floating around, and the rumour 
is strong that the nex regexen will come to Perl 5 this year.

On a related note, something that would be dearly useful in the same 
context is Regular Fragmentations:

   http://www.simonstl.com/projects/fragment/

-- 
Robin Berjon

• References:
  • regular expressions
    • From: David Tolpin <dvd@d...>
  • Re: regular expressions
    • From: Liam Quin <liam@w...>

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