Here you can find the source of isEmail(String str)
public static boolean isEmail(String str)
//package com.java2s; import java.util.regex.Pattern; public class Main { public static boolean isEmail(String str) { Pattern pattern = Pattern.compile("^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$"); return pattern.matcher(str).matches(); }/*from w w w .j ava 2 s . c om*/ }