Re: Isnumeric function?

Oliver Elphick wrote:

>On Wed, 2004-09-08 at 18:48, Josh Berkus wrote:
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>>Theo, Oliver,
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>>>Any reason why you don't like  ~ '^([0-9]?)+\.?[0-9]*$' ?
>>>      
>>>
>>Yes, because it also matches "." , which is not a valid numeric value.
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>>> ~ '^([0-9]+|[0-9]+\\.[0-9]*|[0-9]*\\.[0-9]+)$'
>>>      
>>>
>>Ah, the brute force approach ;-)
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>Nothing like using a nice big hammer!
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Would "^([0-9]+\\.{0,1}[0-9]*|\\.[0-9]+)$" be a little cleaner?

>>Actually, the above could be written:
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>>~ '^([0-9]+)|([0-9]*\\.[0-9]+)$'
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>But that doesn't allow a trailing decimal point.
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>  
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>>... though that still seems inelegant to me.  Is there a regex expert in the 
>>house?
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>All the elegant approaches I can think of match the empty string. There
>must be at least one digit and 0 or 1 decimal point with no other
>characters permitted.  If you use this as a constraint, you could make
>it elegant and combine it with another constraint to exclude '' and '.'.
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>