using System;

​

public static class Program

{

        /// <summary>

        /// Define common patterns for substing actions

        /// </summary>

        public enum StrCut

        {

            BeforeLessStr = 0,

            BeforeInclStr = 1,

            AfterLessStr = 2,

            AfterInclStr = 4

        }

        /// <summary>

        /// Extend Susbstring with ability to pass a string and choose common actions surrounding that string.

        /// </summary>

        /// <param name="s"></param>

        /// <param name="arg">string argument</param>

        /// <param name="e">enum</param>

        /// <returns></returns>

        /// <author>Wed 01-May-19 - metadataconsult@gmail.com</author>

        public static string Substring(this string s, string arg, StrCut e)

        {

            //Range checking, why do you neet a unit test

            if (string.IsNullOrEmpty(s) || string.IsNullOrEmpty(arg)) return string.Empty;

            if (arg.Length > s.Length) return string.Empty;

​

            int idxarg = s.LastIndexOf(arg);

​

            if (idxarg == -1) return string.Empty; //is arg found in string

​

            bool argfits = (idxarg + arg.Length) <= s.Length; //is arg within limit of end of string

            if (e.Equals(StrCut.BeforeLessStr))

            {

                s = s.Substring(0, idxarg);

            }

            else if (argfits && e.Equals(StrCut.BeforeInclStr))

            {

                s = s.Substring(0, (idxarg + arg.Length));

            }

            else if (argfits && e.Equals(StrCut.AfterLessStr))

            {

                s = s.Substring(idxarg + arg.Length);

            }

            else if (e.Equals(StrCut.AfterInclStr))

            {

                s = s.Substring(idxarg);

            }

            return s;

        }

    public static void Main()

    {

        //string SourceURL = "SourceURL:https://metadataconsulting.blogspot.com/2019/04/Using-HTACG-HTML-Tidy-official-release-binaries-for-TidyHTML5Mananged.html"; 

        string SourceURL = "   {\"InsertSymbolText\",\"InsertSymbol\"},";  

        //string SURL = "SourceURL:";

        //string SURL = "SourceURL:https://metadataconsulting.blogspot.com/2019/04/Using-HTACG-HTML-Tidy-official-release-binaries-for-TidyHTML5Mananged.html"; 

        //string SURL = ".html";

        string SURL = ",";

        Console.WriteLine("Let's get rid of length param, like this Substring(0) = " + SourceURL.Substring(0)); 

        Console.WriteLine("BEGIN - Most of time, I just want to get a supply a string a work around it"); 

        Console.WriteLine("org = "+ SourceURL); 

        Console.WriteLine("AfterLessStr = " + SourceURL.Substring(SURL,StrCut.AfterLessStr));

        Console.WriteLine("AfterInclStr = " + SourceURL.Substring(SURL,StrCut.AfterInclStr));

        Console.WriteLine("BeforeInclStr = " + SourceURL.Substring(SURL,StrCut.BeforeInclStr));

        Console.WriteLine("BeforeLessStr = " + SourceURL.Substring(SURL,StrCut.BeforeLessStr));

        Console.WriteLine("END");

    }

}