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

(^-)|-{2,}|[^a-zA-Z-]|(-$) looks for invalid characters, so zero matches to that pattern would satisfy your requirement.