Question

I’m a bit puzzled with a particular regex that is seemingly simple.

The match must be a string with only a-z, A-Z, 0-9 and must have at least one occurence of the ‘-‘ character anywhere in the string.

I have [a-zA-Z0-9-]+ but the problem is, it will also match those without the ‘-‘ character.

ABC123-ABC //should match

ABC123ABC //shouldn't match.

Answer 1

This should work:

^([a-zA-Z0-9]*-[a-zA-Z0-9]*)+$

Also if you want to have exactly 135 hyphens:

^([a-zA-Z0-9]*-[a-zA-Z0-9]*){135}$

or if you want to have at least 23 hyphens but not more than 54 hyphens:

^([a-zA-Z0-9]*-[a-zA-Z0-9]*){23,54}$

You get the point 🙂