Here you can find the source of isIPv6HexCompressedAddress(String ip)
public static boolean isIPv6HexCompressedAddress(String ip)
//package com.java2s; /*//w w w. j a v a2s . co m * Copyright 2016 https://github.com/sdcuike Inc. * All rights reserved. * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 IPV6_HEX_COMPRESSED_PATTERN = Pattern.compile( "^((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)$"); private static final char COLON_CHAR = ':'; private static final int MAX_COLON_COUNT = 7; public static boolean isIPv6HexCompressedAddress(String ip) { int count = 0; for (int i = 0, length = ip.length(); i < length; i++) { if (ip.charAt(i) == COLON_CHAR) { count++; } } return count <= MAX_COLON_COUNT && IPV6_HEX_COMPRESSED_PATTERN.matcher(ip).matches(); } }