Regular Expression for validating DNS label ( host name)

Question

I would like to validate a hostname using only regualr expression.

Host Names (or \'labels\' in DNS jargon) were traditionally defined by RFC 952 and RFC 1123 and m

Answer 1

Javascript regex based on Marks answer:

pattern = /^(?![0-9]+$)(?!.*-$)(?!-)[a-zA-Z0-9-]{1,63}$/g;