Best implementation for an isNumber(string) method

Question

In my limited experience, I\'ve been on several projects that have had some sort of string utility class with methods to determine if a given string is a number. The idea h

Answer 1

I think people here is missing a point. The use of the same pattern repeatedly has a very easy optimization. Just use a singleton of the pattern. Doing it, in all my tests the try-catch approach never have a better benchmark than the pattern approach. With a success test try-catch takes twice the time, with a fail test it's 6 times slower.

public static final Pattern INT_PATTERN= Pattern.compile("^-?[0-9]+(\\.[0-9]+)?$");

public static boolean isInt(String s){
  return INT_PATTERN.matcher(s).matches();
}