Speed test for conversion of UUID (in String form) with dashes to no dashes

RegexSpeedTest.java

package net.hypixel;

public class RegexSpeedTest {
    public static void main(String[] args) {
        String s = "f59fde79-1ab0-499a-b9c3-fbe400e6fca3";
        long start = System.currentTimeMillis();
        for(int i=0; i<100_000; i++) {
            regex(s);
        }
        long end = System.currentTimeMillis();
        long start2 = System.currentTimeMillis();
        for(int i=0; i<100_000; i++) {
            replaceAll(s);
        }
        long end2 = System.currentTimeMillis();
        System.out.println("Regex took "+(end-start)+"ms");
        System.out.println("String fragmentation took "+(end2-start2)+"ms");
    }

    private static String regex(String input) {
        return input.replaceAll("-", "");
    }

    private static String replaceAll(String input) {
        return input.substring(0, 8)+input.substring(9, 13)+input.substring(14, 18)+input.substring(19, 23)+input.substring(24, 36);
    }
}