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Regular Expression Details

Title Test Find Host name
Expression
[A-Za-z0-9]+(?:-[A-Za-z0-9]+)*(?:\.[A-Za-z0-9]+(?:-[A-Za-z0-9]+)*)*
Description
Multi-part host name validator, RFC-compliant but does not validate length of components or overall length
Matches
localhost www.example.com host-1234.example.com
Non-Matches
localhost. -1234.example.com
Author Rating: The rating for this expression. Kevin Dean
Source
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Existing User Comments

Title: Some Errors
Name: Anon
Date: 10/24/2014 2:21:30 AM
Comment:
Doesn't work for - xn--foo.com (IDN) - foo---bar---baz.com (Yes, this is valid.) - foo.com. (Trailing dot. Yes, this is valid.) - foo_bar.baz.com (Underscore, have only seen this at freehosters)

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