Re: Number patterns

[Philippe Lhoste <PhiLho@...>]

On 07/12/2010 11:03, Dirk Laurie wrote:
> I'm writing an input checker for a non-Lua application.  It makes
> liberal use of positive F-format real numbers, e.g. 3, .1, 3., 3.1.
> Can one do that with just one pattern, assuming whitespace already
> trimmed?

Funnily, I just wrote on the topic very recently (for Java, but the regexes still apply, 
more or less).

http://phi.lho.free.fr/serendipity/index.php?/archives/28-Is-this-string-a-number.html

Among other things, I point out that, when possible, it is better (simpler, faster) to use 
two (or more) REs with some logic around it than trying to do everything with one RE.

Now, sometime we take REs from some data source, so the programmatic way might not be 
possible.

--
Philippe Lhoste
--  (near) Paris -- France
--  http://Phi.Lho.free.fr
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