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RE: Fun with regular expressions

• To: <max@m...>,<xml-dev@l...>
• Subject: RE: Fun with regular expressions
• From: "Priscilla Walmsley" <priscilla@w...>
• Date: Wed, 4 Feb 2004 10:40:00 -0500
• In-reply-to: <40210BE6.4010905@m...>
• Organization: Datypic
• Thread-index: AcPrMZTdrtRKE0NOTzy5GoVBIT930wAAzMXQ

Hi,

[^N].* should work.  It works for me with Xerces-J (2.4.0 and 2.2.1).

[.-[NaN]]* doesn't work because "." is just a normal character inside square
brackets.

Hope that helps,
Priscilla

> -----Original Message-----
> From: Max Chappell [mailto:max@m...] 
> Sent: Wednesday, February 04, 2004 10:13 AM
> To: 'xml-dev@l...'
> Subject:  Fun with regular expressions
> 
> Hi,
> 
> I need to restrict xs:double to any allowable double value - with the 
> exception of NaN.
> 
> Having looked further into regular expressions for XML Schema - there 
> seems to be contradictory advice around.
> 
> Following one set of advice would allow us to use ^ at the 
> start of the 
> reg exp to exclude NaN:
> "[^N].*"  - this doesn't work with either Xerces or XML Spy.
> I find the relevant section of the W3C spec somewhat difficult to 
> decipher. However, I get the impression that ^ is simply a normal 
> character in xsd land..
> 
> 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...
> and "[.*-[NaN]]*" - ditto... 
> 
> So then, the next option is to define a larger regular 
> expression such as:
> "[+\-]?(\d+(\.\d*)?([eE][+\-]?\d+)?)|([+\-]?INF)"
> 
> This does not allow .00009 for example, so we'll have to make the reg 
> exp even more complicated.
> 
> 
> My question is:
> Does anyone know of a simpler way of doing this?
> 
> Thanks
> 
> Max
> 
> 
> 
> 
> 
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• References:
  • Fun with regular expressions
    • From: Max Chappell <max@m...>

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