Posted by shimmyshack on 02/16/07 19:13

On Feb 16, 6:08 pm, Tom <t...@to.com> wrote:
> On Fri, 16 Feb 2007 11:55:02 +0000, raj wrote...
>
> >Hi,
>
> >I have to repost this to restate the question. No disrespect to the original
> >reply.
>
> >Please can someone help regarding providing a regular expression for entering
> >a set of characters with letters, numbers, periods (.), hyphens (-), or
> >underscores (_) only.
>
> >I need to do this using ereg
>
> >I've got as far as this but it doesn't quite work:
>
> >$pattern="^([a-z0-9.-_]{0,30})$";
> >if(ereg($pattern,$_SESSION['id']))
> >...
>
> >Thank you in advance.
>
> >Kind regards,
>
> >Raj (newbie)
>
> Normally with "preg" I need to put the hyphen last, otherwise it may confuse a
> literal hyphen with the special character. Such as the hyphens you're using to
> specify the range of letters and numbers. The same may apply to the function
> you're trying to use.
>
> Tom
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If by $_SESSION['id'] you mean the standard PHPSESSID, it has 32
characters, no more no less, be default.
If not then Tom is right, hyphen last.

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