Write code to check if a string is Number using regex
//package com.book2s; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static void main(String[] argv) { String numStr = "book2s.com"; System.out.println(isNumber(numStr)); }//from w w w. j av a 2s. c o m public static boolean isNumber(String numStr) { if (isEmpty(numStr)) return false; Pattern pattern = Pattern.compile("[0-9]*"); Matcher match = pattern.matcher(numStr); return match.matches(); } public static boolean isEmpty(CharSequence s) { return s == null || s.length() == 0; } }