CODEWITHSUNDEEP
javascriptregex
Java P
Java P

Reputation: 2281

regular expression for wildcard domain validation

I am new to writing regular expressions. I am planning to write regular expression for validating wild card domain matching. Here are scenarios.

Correct:

Incorrect:

Here is my regular expression for above secnario

/^(([a-zA-Z0-9]|\*\.[a-zA-Z0-9])([a-zA-Z0-9\-_]{0,243}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}$/

It is working as expected. can we improve or write better expression?

Upvotes: 0

Views: 6660

Answers (1)

vlad_tepesch
vlad_tepesch

Reputation: 6891

^(\*\.)?([\w-]+\.)+[\w-]+$

matches your examples. Demo 1

From my point of view i would also treat the third negative example as correct.

^(([\w-]+\.)|(\*\.))+[\w-]+$

Demo 2

edit:
you may have to adapt the character classes to contains all allowed characters. I wanted to keep the regex easy to read

Upvotes: 2

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