Validating DNS with Regex

Question

Possible Duplicate:
Regular expression to match hostname or IP Address?

I need to validate a string that should contain DNS. Which regex is appropiate?

You need to be more specific; the phrase "contains DNS" is not well-defined. Are you talking about `A` records? — John Feminella, Jun 24 '10 at 10:30
@Kaan - That's an IP... one of google's free DNS service nodes, specifically ;) — Nick Craver, Jun 24 '10 at 10:33

score 4 · Answer 1 · answered Jun 24 '10 at 10:35

4

This regex should work: .*DNS.*

answered Jun 24 '10 at 10:35

Robert Love

score 2 · Answer 2 · answered Jun 24 '10 at 10:30

2

Using regexlib works wonders!

answered Jun 24 '10 at 10:30

Leom Burke

score 1 · Accepted Answer · edited May 23 '17 at 12:31

1

It seems someone asks this question yet, try to search before asking see this

edited May 23 '17 at 12:31

Community

answered Jun 24 '10 at 10:33

Arsen Mkrtchyan

score 0 · Answer 4 · answered Jun 24 '10 at 10:43

0

(?=^.{1,254}$)(^(?:(?!\d+\.|-)[a-zA-Z0-9_\-]{1,63}(?<!-)\.?)+(?:[a-zA-Z]{2,})$)

answered Jun 24 '10 at 10:43

Svisstack

4 Answers4