Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {

    public static boolean isValidUserName(String username) {
        String str = "^[0-9a-zA-Z_]{6,12}$";
        Pattern p = Pattern.compile(str);
        Matcher m = p.matcher(username);
        return m.matches();
    }
}