从java中的String提取especific URL

Question

I have a String like this:

.........e1.whatsapp.net..............>.ns1.p13.dynect..hostmaster.whatsapp.com.x:a>.......X..:....

And I need to extract the first URL:

e1.whatsapp.net

I was trying with the solution in this post but not working for me, maybe because the amount of dots. Maybe if I try with another pattern regex, but I know nothing about "regex".

Any sugestion?

Answer 1

This code below may help you to extract the email with using regex.

class StringSeperator {

  public static void main(String args[]){
    String urlString = ".........e1.whatsapp.net..............>.ns1.p13.dynect..hostmaster.whatsapp.com.x:a>.......X..:....";
    String array[] = urlString.split("\\.\\.+"); 
    System.out.println(array[1]);
  }
}

Here I use regex as \\\\.\\\\.+ which means two or more dots. The string split using two or more dots.

If I further explain about regex. Here I use \\\\. for depicting the dot and use + for saying one or more occurrences of a dots. For more details about Java regex please follow below link.

https://www.tutorialspoint.com/java/java_regular_expressions.htm