java正则表达式判断邮件地址是否合法

java正则表达式判断邮件地址是否合法

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Scanner;
public class Email{
	public static void main(String []args){
		Scanner scan = new Scanner(System.in);
		String str=null;
		str = scan.next();
		String pat="[a-zA-Z0-9_\\-\\.]+@[a-zA-Z0-9]+(\\.(com))";
		Pattern p = Pattern.compile(pat);//实例化Pattern类
		Matcher m = p.matcher(str);//验证内容是否合法
		if(m.matches())
		  System.out.println("YES");
		else
		  System.out.println("NO");
	}
}