Java tutorial
//package com.java2s; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static boolean isPassWordIllegal(String pwd) { Pattern p = Pattern.compile("/(?!^\\d+$)(?!^[a-zA-Z]+$)[0-9a-zA-Z]{6,12}/"); Matcher m = p.matcher(pwd); return m.matches(); } }