Check if IP address match pattern

      
/*
 * This file is part of aion-emu <aion-emu.com>.
 *
 * aion-emu is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * aion-emu is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with aion-emu.  If not, see <http://www.gnu.org/licenses/>.
 */
//package com.aionemu.commons.utils;

/**
 * @author KID, -Nemesiss-
 */
public class NetworkUtils
{
  /**
   * check if IP address match pattern
   * 
   * @param pattern
   *            *.*.*.* , 192.168.1.0-255 , *
   * @param address
   *            - 192.168.1.1<BR>
   *            <code>address = 10.2.88.12  pattern = *.*.*.*   result: true<BR>
   *                address = 10.2.88.12  pattern = *   result: true<BR>
   *                address = 10.2.88.12  pattern = 10.2.88.12-13   result: true<BR>
   *                address = 10.2.88.12  pattern = 10.2.88.13-125   result: false<BR></code>
   * @return true if address match pattern
   */
  public static boolean checkIPMatching(String pattern, String address)
  {
    if (pattern.equals("*.*.*.*") || pattern.equals("*"))
      return true;

    String[] mask = pattern.split("\\.");
    String[] ip_address = address.split("\\.");
    for (int i = 0; i < mask.length; i++)
    {
      if (mask[i].equals("*") || mask[i].equals(ip_address[i]))
        continue;
      else if (mask[i].contains("-"))
      {
        byte min = Byte.parseByte(mask[i].split("-")[0]);
        byte max = Byte.parseByte(mask[i].split("-")[1]);
        byte ip = Byte.parseByte(ip_address[i]);
        if (ip < min || ip > max)
          return false;
      }
      else
        return false;
    }
    return true;
  }
}

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Check if IP address match pattern : IP Address « Network Protocol « Java

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