content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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.
   */
  package com.alibaba.nacos.client.utils;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * ip tool
   *
   * @author Nacos
   */
  @SuppressWarnings("PMD.ClassNamingShouldBeCamelRule")
  public class IPUtil {
  
      private static final Pattern IPV4_PATTERN = Pattern.compile("^((25[0-5]|2[0-4]\\d|[01]?\\d\\d?)\\.){3}(25[0-5]|2[0-4]\\d|[01]?\\d\\d?)$");
      private static final Pattern IPV6_PATTERN = Pattern.compile("^([\\da-fA-F]{1,4}:){7}[\\da-fA-F]{1,4}$");
  
      public static boolean isIPV4(String addr) {
          return isMatch(addr, IPV4_PATTERN);
      }
  
      public static boolean isIPV6(String addr) {
          return isMatch(addr, IPV6_PATTERN);
      }
  
      private static boolean isMatch(String data, Pattern pattern) {
          if (StringUtils.isBlank(data)) {
              return false;
          }
          Matcher mat = pattern.matcher(data);
          return mat.find();
      }
  }
  