Question

I have a string

abc.xyz.qweweer.cccc

This is actually going to be a Java package name.

I am trying to find out the last string using reg exp, in the above example cccc is the last String.

Basically I am trying to find out the class name from the package string.

How to find out through Java

Answer 1

Given a string pkg = "abc.xyz.qweweer.cccc" you can solve it like this:

• Using indexOf:

  int index = pkg.lastIndexOf('.');
  String lastPart = index == -1 ? pkg : pkg.substring(index + 1);
  

• Using regular expressions with Matcher:

  Matcher m = Pattern.compile("[^.]*$").matcher(pkg);
  String lastPart = m.find() ? m.group() : null;
  

• Using split (variation of RMT’s answer):

  String[] names = pkg.split("\\.");
  String lastPart = names[names.length - 1];