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Re: regular expressions

• To: xml-dev@l...
• Subject: Re: regular expressions
• From: Liam Quin <liam@w...>
• Date: Thu, 29 Jan 2004 16:19:33 -0500
• In-reply-to: <200401292002.i0TK2kHX080757@a...>
• References: <200401292002.i0TK2kHX080757@a...>
• User-agent: Mutt/1.3.28i

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.

I'll also note you can simplify your specific pattern using character
classes, e.g. :alnum: or \a (depending on the schema language), at
some minor possible cost in portability.

Liam

-- 
Liam Quin, W3C XML Activity Lead, http://www.w3.org/People/Quin/
http://www.holoweb.net/~liam/

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    • From: Robin Berjon <robin.berjon@e...>
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• References:
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    • From: David Tolpin <dvd@d...>

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