javascript url regex

Question

How can I allow users to enter both subdomain and domain names without the http:// prefix using a regex in javascript. I need to allow: domainname.com or www.domainname.com or www.domainname.co.uk. I have this at the moment which expects www. :

/^(?=www\.)[A-Za-z0-9_-]+\.+[A-Za-z0-9.\/%&=\?_:;-]+$/ix.test(value);

Pengman · Accepted Answer · 2011-09-02 09:41:09Z

1

Try this:

/^(?=www\.)?[A-Za-z0-9_-]+\.+[A-Za-z0-9.\/%&=\?_:;-]+$/

Marking the www group with a ? makes it a zero-or-one match, which is what you want as I understand it.

Tested with http://www.regular-expressions.info/javascriptexample.html

answered Sep 2, 2011 at 9:41

Pengman

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1 Comment

Laurence Tuck Over a year ago

thanks for the simple answer - just ading the ? is what I needed.

Richard Dalton · Accepted Answer · 2011-09-02 09:32:45Z

0

This seems to work when tested on http://www.regextester.com/

/^(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/

answered Sep 2, 2011 at 9:32

Richard Dalton

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