Regex to match '-' delimited alphanumeric words

Question

I would like to test if user type only alphanumeric value or one \"-\".

hello-world                 -> Match
hello-first-world           -> match
this-         


        

Answer 1

Try this:

/^[A-Za-z0-9]+(?:-[A-Za-z0-9]+)*$/

This will only match sequences of one or more sequences of alphanumeric characters separated by a single -. If you do not want to allow single words (e.g. just hello), replace the * multiplier with + to allow only one or more repetitions of the last group.