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

Mine is:

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

This is much shorter

Got it tested with several example

Match:

• 00:00
• 7:43
• 07:43
• 19:00
• 18:23

And doesn't match any invalid instance such as 25:76 etc ...