Get domain name from URL without java.net in Java

Question

I would like to know in GWT is there an easy way to get host name from url WITHOUT java.net.*; Since client side doesn't support this package.

Input ejw.example.com/anotherexample?fun=no
output example.com

Input https://www3.example.com/yeteagainanotherexample?fun=miserable
output example.com

Answer 1

com.google.gwt.user.client.Window.Location.getHost()

Answer 2

Try with com.google.gwt.regexp.shared.RegExp that is used for regular expressions with features like Javascript's RegExp, plus Javascript String's replace and split methods (which can take a RegExp parameter).

Try below regex that captures all the everything between first dot and first forward slash and get it at match index 1.

https*://\w+\.(.*?)/

Here is demo on debuggex and regexr

Sample code:

String url="https://www3.example.com/yeteagainanotherexample?fun=miserable";

System.out.println(RegExp.compile("https*://\\w+\\.(.*?)/").exec(url).getGroup(1));

---

Note: I am not good in regex so please change the regex pattern as per your need. Read more about

• What is a good regular expression to match a URL?

• JavaScript Regex to match a URL in a field of text