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   Re: [xml-dev] Fun with regular expressions

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Robin Berjon wrote:

> Max Chappell wrote:
>> Another piece of advice is to use nested brackets such as: 
>> "[a-zA-Z-[ABC]]" (Use any letters except AB or C).
>> Along these lines I've tried:
>> "[.-[NaN]]*" - far from working...
> Does something like (.-[Na])+ work? I'm unsure that . is a proper 
> character class that's subject to substraction.

        The type declaration is based upon xs:double, restricting 
further by the use of pattern should mean the two patterns are ANDed 
together. I was working
        on a vague assumption that . works like a 'super' character 
class for ANDed patterns.
        I'm not convinced about the use of . either - However, since I 
find regular expressions as much fun as pulling teeth, I thought I'd 
give it a go..

>> This does not allow .00009 for example, so we'll have to make the reg 
>> exp even more complicated.
> I believe I have one somewhere that's close to being good and that 
> could exclude NaN. However it's several lines long (when wrapped) and 
> last year it tended to crash validators. I can dig it up if you don't 
> find a pleasant solution. 

    I may well take you up on that offer!




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