Question

I need to check a URL string, and if the URL does not contain “www.”, insert it in the correct position.

For example, the strings on the left should be transformed as indicated:

www.myweb.com        => www.myweb.com
myweb.com            => www.myweb.com
http://myweb.com     => http://www.myweb.com or www.myweb.com
http://www.myweb.com => http://www.myweb.com or www.myweb.com

Answer 1

try as:

 if(!str.contains("www")){
  if(str.contains("://"))
    str=str.replace("://","://www.");
  else
    str="www."+str;
}