[RESOLVED] Regular expression problem

[wshost]

I'm pretty new to regular expressions and am not sure where to start. Using eregi() so that it is case insensitive I want to be able to verify a string has the following:

1. number 0-9 and optional 0-9 and a one digit letter (t,d,w,m)
2. Or the reverse of this

Some samples of legitimate strings:

t03
3t
05w
w05

The following would not be legit:

3t4
a14
113t

So the only legitimate 1 character letters are t, d, w, and m and the numbers can be 1 or 2 characters.

Thank you so much for your help!

This is what I have but it doesn't seem to be working:

eregi("[0-9][0-9]?(t|d|w|m)$ | (t|d|w|m)[0-9][0-9]?$", $str, $out);

[bpat1434]

something like:

"^{[t|d|w|m]{1}?[0-9]{1}[0-9]{1}?[t|d|w|m]{1}?$"}

WOuld that work?

[wshost]

Thanks for your reply, it definitely helped.

Here is what we came up with that I think follows our ruleset perfectly:

(^{[0-9][0-9]?[tdwm]$)|([tdwm][0-9][0-9]?$)}

Though, please let me know if you see any problems with this, and thanks!

[bpat1434]

Nope, seems right to me.... and my original posting is wrong... I just threw it up there, but at least it got you thinking.