CODEWITHSUNDEEP
javaandroid
Jaume
Jaume

Reputation: 3800

Add "www." to URL string

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

Upvotes: 0

Views: 155

Answers (2)

Darshan Rivka Whittle
Darshan Rivka Whittle

Reputation: 34051

I'm not great with regular expressions, but I believe ^(http://)?+((.{0,2}[^w])|(.{3}[^.])) accomplishes what you want:

String s1 = "www.myweb.com";
String s2 = "myweb.com";
String s3 = "http://myweb.com";
String s4 = "http://www.myweb.com";

String pattern = "^(http://)?+((.{0,2}[^w])|(.{3}[^.]))";
String www = "$1www.$2";

System.out.println(s1 + " -> " + s1.replaceFirst(pattern, www));
System.out.println(s2 + " -> " + s2.replaceFirst(pattern, www));
System.out.println(s3 + " -> " + s3.replaceFirst(pattern, www));
System.out.println(s4 + " -> " + s4.replaceFirst(pattern, www));

produces this output:

www.myweb.com -> www.myweb.com
myweb.com -> www.myweb.com
http://myweb.com -> http://www.myweb.com
http://www.myweb.com -> http://www.myweb.com

Since I don't consider myself strong with regular expressions, I'm not going to say this is foolproof, but it works on your example strings and on some tougher ones I tested it with.

Upvotes: 2

ρяσѕρєя K
ρяσѕρєя K

Reputation: 132992

try as:

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

Upvotes: 0

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