Java tutorial
//package com.java2s; /* Copyright (C) 2010 Haowen Ning This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static boolean isHTML(String s) { assert s != null : "Verify Null string"; Pattern htmlPattern1 = Pattern.compile("<[a-zA-Z]+[0-9]*(\\s[a-zA-Z]+[0-9]*=.*)*\\s*/??>"); Pattern htmlPattern2 = Pattern.compile("&#?[a-z0-9]+;"); Matcher m1 = htmlPattern1.matcher(s); Matcher m2 = htmlPattern2.matcher(s); return m1.find() || m2.find(); } }