Regular expressions generator?

[Prine]

are there any packages available? something i can type in and bam, a string is produced, one that i can add to my form???

[Prine]

10-06-a

The above are the only characters i want the user to enter, as in 2 numeric characters, a hyphen, 2 more numeric characters, a hyphen and a letter.

I managed to do the following

$valid_month = preg_match('/^[0-90-9]+\-\[0-90-9]+\-\[a-z]$/', $_POST['month_id']);

is that correct so far?

[laserlight]

More like:

$valid_month = preg_match('/^\d{2}\-\d{2}\-[a-z]$/', $_POST['month_id']);