jquery - javascript url regex -

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I use a regex in JavaScript to enter both subdomain and domain names without users http: // prefix How can I give permission? I need to allow: domainname.com or www.domainname.com or www.domainname.co.uk. At this time I hope to www. : 

  / ^ (? = Www.) [A-Za-z0-9 _-] + \. [E-za-j0-9 \ /% & Amp; = \? _: -] + $ / ix.test (value);    
 
 
 Try it out:  
  / ^ (? = Www.)? [E-za-j 0-9 _-] + \. [E-za-j0-9 \ /% & Amp; = \? _ :; -] + $ /  <
 
 A ? Marking the www group with  makes it a zero or a match, which is what I understand.

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