Defining Input length boundaries using RegEx

Question

I need to use a RegEx to set an upper boundry for the length of an input string.

Its been ages since I used RegEx so any help would be good. :)

Answer 1

If you want max 10 characters:

^.{,10}$

Answer 2

^.{,5}$

The ^ and $ make it check the entire string. {,5} is maximum of five.