Java使用正则表达式从字符串中提取 IP 地址

迈不过友情╰ 2023-10-01 13:21 37阅读 0赞

import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    public class ExtractIP {
        public static void main(String[] args) {
            String ipString = "1.1.1.1 2.2.2.2";
            String IPADDRESS_PATTERN = "(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)";
    
            Pattern pattern = Pattern.compile(IPADDRESS_PATTERN);
            Matcher matcher = pattern.matcher(ipString);
            while (matcher.find()) {
                System.out.println(matcher.group());
            }
    
        }
    
    }

/**
     * This class provides a variety of basic utility methods that are not
     * dependent on any other classes within the org.jamwiki package structure.
     */
    public class Utilities {
      private static Pattern VALID_IPV4_PATTERN = null;
      private static Pattern VALID_IPV6_PATTERN = null;
      private static final String ipv4Pattern = "(([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.){3}([01]?\\d\\d?|2[0-4]\\d|25[0-5])";
      private static final String ipv6Pattern = "([0-9a-f]{1,4}:){7}([0-9a-f]){1,4}";
    
      static {
        try {
          VALID_IPV4_PATTERN = Pattern.compile(ipv4Pattern, Pattern.CASE_INSENSITIVE);
          VALID_IPV6_PATTERN = Pattern.compile(ipv6Pattern, Pattern.CASE_INSENSITIVE);
        } catch (PatternSyntaxException e) {
          //logger.severe("Unable to compile pattern", e);
        }
      }
    
      /**
       * Determine if the given string is a valid IPv4 or IPv6 address.  This method
       * uses pattern matching to see if the given string could be a valid IP address.
       *
       * @param ipAddress A string that is to be examined to verify whether or not
       *  it could be a valid IP address.
       * @return <code>true</code> if the string is a value that is a valid IP address,
       *  <code>false</code> otherwise.
       */
      public static boolean isIpAddress(String ipAddress) {
    
        Matcher m1 = Utilities.VALID_IPV4_PATTERN.matcher(ipAddress);
        if (m1.matches()) {
          return true;
        }
        Matcher m2 = Utilities.VALID_IPV6_PATTERN.matcher(ipAddress);
        return m2.matches();
      }
    }