Question

I have a simple string Ex. 1.0.0.2 and I want to split and retrieve only part of the string:
output: 1.0.0 basically I want to remove all text after the third . included. I tried with split() function, count the occurrances of . and, if greater than 2, get the indexOf() third point and substring(). Is there an easier or faster method to achieve this? Maybe using regEx?

Edit:
I don’t know how many dots there will be.

Answer 1

If you don’t know for sure that there will be exactly three dots — so you can’t use lastIndexOf() — then here is a regex-based solution:

final Matcher m = Pattern.compile("^[^.]*(?:[.][^.]*){0,2}").matcher(input);
m.find(); // guaranteed to be true for this regex
final String output = m.group(0);