SemVer.PartialVersion.PartialVersion C# (CSharp) Method

        public PartialVersion(string input)
        {

            string[] xValues = { "X", "x", "*" };

            if (input.Trim() == "")
            {
                // Empty input means any version
                return;
            }

            var match = regex.Match(input);
            if (!match.Success)
            {
                throw new ArgumentException(String.Format("Invalid version string: \"{0}\"", input));
            }

            if (xValues.Contains(match.Groups[1].Value))
            {
                Major = null;
            }
            else
            {
                Major = Int32.Parse(match.Groups[1].Value);
            }

            if (match.Groups[2].Success)
            {
                if (xValues.Contains(match.Groups[3].Value))
                {
                    Minor = null;
                }
                else
                {
                    Minor = Int32.Parse(match.Groups[3].Value);
                }
            }

            if (match.Groups[4].Success)
            {
                if (xValues.Contains(match.Groups[5].Value))
                {
                    Patch = null;
                }
                else
                {
                    Patch = Int32.Parse(match.Groups[5].Value);
                }
            }

            if (match.Groups[6].Success)
            {
                PreRelease = match.Groups[7].Value;
            }
        }