Java tutorial
//package com.java2s; /* * Copyright (C) 2010 ZXing authors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.regex.Pattern; public class Main { private static final Pattern HEX_DIGITS = Pattern.compile("[0-9A-Fa-f]+"); /** * Check if wepKey is a valid hexadecimal string. * @param wepKey the input to be checked * @return true if the input string is indeed hex or empty. False if the input string is non-hex * or null. */ static boolean isHexWepKey(CharSequence wepKey) { if (wepKey == null) { return false; } int length = wepKey.length(); // WEP-40, WEP-104, and some vendors using 256-bit WEP (WEP-232?) return (length == 10 || length == 26 || length == 58) && HEX_DIGITS.matcher(wepKey).matches(); } }