regex number range 1-17

Question

Can someone tell me how to match a number between 1-17 with a regex:

I tried [1-9]|1[0-7] but it matches 8 in the 18 for example because of the first part.

A

Answer 1

You need to put anchors around the regex or it will match substrings:

^(?:[2-9]|1[0-7]?)$

I've also taken the liberty to make your regex a bit more efficient: