Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

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

public class Main {
    public static boolean isValidUsername(String username) {
        String expression = "^[a-zA-Z0-9_]+$";
        Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(username);
        return matcher.matches();
    }
}