Remove the string on the beginning of an URL

Question

I want to remove the  www   part from the beginning of an URL string  For instance in these test cases   e g  www test com   test com e g  www testwww com   testwww com e g  testwww com   testwww com  if it doesn t exist   Do I need to use Regexp or is there a smart function

User · Accepted Answer

Depends on what you need  you have a couple of choices  you can do      this will replace the first occurrence of  www   and return  testwww com   www testwww com  replace  www             this will slice the first four characters and return  testwww com   www testwww com  slice 4       this will replace the www  only if it is at the beginning  www testwww com  replace    www

User · Answer

Yes  there is a RegExp but you don t need to use it or any  smart  function   var url    www testwww com   var PREFIX    www    if  url indexOf PREFIX     0         PREFIX is exactly at the beginning   url   url slice PREFIX length

User · Answer

You can cut the url and use response sendredirect new url   this will bring you to the same page with the new url

User · Answer

Either manually  like  var str    www test com       rmv    www     str   str slice  str indexOf  rmv     rmv length      or just use  replace     str   str replace  rmv

User · Answer

You can overload the String prototype with a removePrefix function   String prototype removePrefix   function  prefix        const hasPrefix   this indexOf prefix      0      return hasPrefix   this substr prefix length    this toString         usage   const domain    www test com  removePrefix  www        test com

User · Answer

Try the following  var original    www test com   var stripped   original substring 4

User · Answer

Another way   Regex Replace urlString   www          1

User · Answer

If the string has always the same format  a simple substr   should suffice   var newString   originalStrint substr 4

[javascript] Remove the string on the beginning of an URL

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