How to substring a string to the second dot (.) in Java?

Question

I have a String which has many segments separated by a dot (.) like this:

codes.FIFA.buf.OT.1207.2206.idu

I want to get a substring only until second dot, like codes.FIFA.

How to substring just until the second dot?

Answer 1

Just find the first dot, then from there the second one:

String input = "codes.FIFA.buf.OT.1207.2206.idu";
int dot1 = input.indexOf(".");
int dot2 = input.indexOf(".", dot1 + 1);
String substr = input.substring(0, dot2);

Of course, you may want to add error checking in there, if dots are not found.

Answer 2

Something like this will do the trick:

String[] yourArray = yourDotString.split(".");
String firstTwoSubstrings = yourArray[0] + "." + yourArray[1];

The variable firstTwoSubstrings will contain everything before the second ".". Beware that this will cause an exception if there are less than two "." in your string.

Hope this helps!