Re: Isnumeric function?

On Wed, 2004-09-08 at 18:48, Josh Berkus wrote:
> Theo, Oliver,
>
> > Any reason why you don't like ~ '^([0-9]?)+\.?[0-9]*$' ?
>
> Yes, because it also matches "." , which is not a valid numeric value.
>
> > ~ '^([0-9]+|[0-9]+\\.[0-9]*|[0-9]*\\.[0-9]+)$'
>
> Ah, the brute force approach ;-)

Nothing like using a nice big hammer!

> Actually, the above could be written:
>
> ~ '^([0-9]+)|([0-9]*\\.[0-9]+)$'

But that doesn't allow a trailing decimal point.

>
> ... though that still seems inelegant to me. Is there a regex expert in the
> house?

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 '.'.
--
Oliver Elphick olly(at)lfix(dot)co(dot)uk
Isle of Wight http://www.lfix.co.uk/oliver
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