/Guanima.Redis/Utils/StringUtils.cs

using System;

using System.Text.RegularExpressions;



namespace Guanima.Redis.Utils

{

    public class StringUtils

    {

        const string IPRegexPattern = @"

            ^(                      # Anchor to the beginning of the line

                                    # Invalidations

              (?!25[6-9])           # If 256, 257...259 are found STOP

              (?!2[6-9]\d)          # If 260-299 stop

              (?![3-9]\d\d)         # if 300-999 stop

              (?!000)               # No zeros

              (\d{1,3})             # Between 1-3 numbers

              (?:[.-]?)             # Match but don't capture a . or -

             ){4,6}                 # IPV4 IPV6

            (?<Url>[A-Za-z.\d]*?)   # Subdomain is mostly text

            (?::)

            (?<Port>\d+)";



        private static readonly Regex IPRegex = new Regex(IPRegexPattern, 

            RegexOptions.Compiled | RegexOptions.IgnorePatternWhitespace | RegexOptions.IgnoreCase);

 

        public static bool IsValidIpAddress(string candidate,out string host, out int port)

        {

            if (!String.IsNullOrEmpty(candidate))

            {

                Match m = IPRegex.Match(candidate);

                if (m.Success)

                {

                    host = m.Groups["Url"].Value;

                    port = int.Parse(m.Groups["Port"].Value);

                    return true;

                }

            }

            host = null;

            port = 6379;

            return false;

        }



        public static bool IsNumericIpAddress(string candidate)

        {

            string host = "";

            int port = 0;

            var good = IsValidIpAddress(candidate, out host, out port)

                        && String.IsNullOrEmpty(host);

            return good;

        }

    }

}