In java how to get substring from a string till a character c?

Question

I have a string (which is basically a file name following a naming convention) abc.def.ghi

I would like to extract the substring before the first

Answer 1

How about using regex?

String firstWord = filename.replaceAll("\\..*","")

This replaces everything from the first dot to the end with "" (ie it clears it, leaving you with what you want)

Here's a test:

System.out.println("abc.def.hij".replaceAll("\\..*", "");

Output:

abc