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Re: regular expressions

• To: xml-dev@l...
• Subject: Re: regular expressions
• From: Joe English <jenglish@f...>
• Date: Thu, 29 Jan 2004 13:12:41 -0800
• In-reply-to: <200401292002.i0TK2kHX080757@a...>
• References: <200401292002.i0TK2kHX080757@a...>

David Tolpin wrote:

> Some schema languages use string regular expressions to check
> lexical space of attributes and character data.  The regex
> strings often become uncomprehensible, such as
> (([a-zA-Z][0-9a-zA-Z+\-\.]*:)?/{0,2}[0-9a-zA-Z;/?:@&=+$\.\-_!~*'()%]+)?(#[0-9
> a-zA-Z;/?:@&=+$\.\-_!~*'()%]+)?
> [...]
> Providing a structured syntax, similar to that for XML, would help reading an
> d debugging
> them, for example,
>
>     s-pattern="""
>       comment = "\(([^\(\)\\]|\\.)*\)"
>       atom = "[a-zA-Z0-9!#$%&'*+\-/=?\^_`{|}~]+"
>       atoms = atom "(\." atom ")*"
>       [...]
>
> Why isn't it done?


HyLex used a similar syntax for regular expressions.
I've always wondered why the idea never caught on elsewhere.
(Then again, none of the ideas from HyTime ever really
caught on...)


--Joe English

  jenglish@f...

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