Java tutorial
//package com.java2s; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static boolean isMobileNOFormat(String mobile) { if (mobile != null && mobile.length() > 0 && isNumeric(mobile)) { return true; } else { return false; } } public static boolean isNumeric(String str) { Pattern pattern = Pattern.compile("[0-9]*"); Matcher isNum = pattern.matcher(str); if (!isNum.matches()) { return false; } return true; } }