Fixing std.string

[Ezneh]

Andrei Alexandrescu Wrote:

 
> I guess
> 
>    return collectException(to!real(input)) is null;
> 
> should be a fine replacement for isNumeric.
> 
> 
> Andrei


I found another way to improve the isNumeric function.

I'm doing it  with a (ugly) regular expression but it works very well but maybe we could (should !) improve it a bit more.


See in the attach file how I did it.
There are some asserts and "old tests". I probably forget something but this can be a new base for the isNumeric function.


Give me any feed back and telle me wath you think about it.

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