Regular expression for matching HH:MM time format

Question

I want a regexp for matching time in HH:MM format. Here\'s what I have, and it works:

^[0-2][0-3]:[0-5][0-9]$

This matches everything from

Answer 1

You can use this one 24H, seconds are optional

^([0-1]?[0-9]|[2][0-3]):([0-5][0-9])(:[0-5][0-9])?$