PHP regex to check a string

Question

I am looking for a PHP regex to check a string is:

A good example is: A123

Thanks!

deceze · Accepted Answer · 2010-09-02 02:39:15Z

4

^[A-Z][0-9]{3}$

Explanation:

^         # start of string
[A-Z]     # one character, A-Z
[0-9]{3}  # three characters, 0-9
$         # end of string

answered Sep 2, 2010 at 2:39

deceze♦

525k89 gold badges806 silver badges954 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

\d can be used as a shortcut for [0-9] as well.

@Amber Yup, I was going for something as easy to understand as possible here though. :)