The Scanner class is not only useful for reading input from the console but also for parsing text and strings with custom delimiters.
Source Code
String input = "1 fish 2 fish red fish blue fish";
Scanner s = new Scanner(input).useDelimiter("\s*fish\s*");
System.out.println(s.nextInt()); // Outputs 1
System.out.println(s.nextInt()); // Outputs 2
s.close();