Preg_match question

[this.user]

I want to use preg_match to make sure a string is always 6 characters long and only contains 0-9 and the letters A-F.

 

I have this but it does not work:

 

 

'/^[0-9A-F]{6}$/'

[cags]

Hmm... that pattern looks right. Can we see the code just in case there's an error there. Also some data you think should match but doesn't.

[salathe]

If there are any lowercase letters, you'll likely need to make the pattern case-insensitive (with the i modifier) or extend the character class to include lowercase letters: /^[0-9A-F]{6}$/Di or /^[0-9a-fA-F]{6}$/D respectively (note both use the D modifier, more info).