Add notest for C# Regular Expression

Author: jerobado

C#/Regular Expression/Program.cs

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+/*
+ * 1. Create a regex pattern
+ * 2. Use Match() method find pattern in ProjectDescription
+ * 3. If Match.Success, remove matched pattern in ProjectDescription using String.Replace() method
+ */
+
+
+using System;
+using System.Text.RegularExpressions;
+
+
+namespace RegexTutorial
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("C# Regular Expression\n");
+
+            // OKAY
+            //var sampleText = "BA8234732 - Gerol Bado Project";
+            //var sampleText = "INC8234732 - Gerol Bado Project";
+            //var sampleText = "LINK034 - Gerol Bado Project";
+            //var sampleText = "REQ298374892374983274 - Gerol Bado Project";
+            //var sampleText = "ADMINISTRATION";
+            //var sampleText = "BakerAsssyt Support";
+            //var sampleText = "SC8234732 Gerol Bado Project";
+            //var sampleText = "BA192783 Support";
+            //var sampleText = "LINK09 Gerol Bado Project";
+            //var sampleText = "S589374- Gerol Bado Project";
+            //var sampleText = "S589374 -Gerol Bado Project";
+            //var sampleText = "NOC Intake System";
+            //var sampleText = "PDcalendar DLL";
+            //var sampleText = "00000014 - Gerol Bado Project";
+            //var sampleText = "Gerol Bado Project";
+            //var sampleText = "00000015 Gerol Bado Project";
+            //var sampleText = " 372 BakerWorld to SharePoint 2019";
+            //var sampleText = "000 - My PBS21";
+            //var sampleText = "007 - My BitLocker";
+            //var sampleText = "1234  - Gerol Bado Project";
+
+
+            var sampleText = "Zero pattern!";
+            //var sampleText = "SC23423 Legal Knowhow Portal";
+
+            Console.WriteLine(sampleText);
+            Console.WriteLine(TrimProjectDescription(sampleText));
+
+        }
+
+
+        static string TrimProjectDescription(string projectDescription)
+        {
+            var digitPattern = @"\s*\d+";                   // i.e. 000, 0000123, ' 372'
+            var alphanumericPattern = @"([A-Z]+\d+)";       // i.e. S584931, BA378232, LINK014
+            var dashspacePattern = @"(\s*-*\s*)";           // i.e. ' - ', '- ', ' -', ' '
+
+            var pattern = $"^({digitPattern}|{alphanumericPattern}){dashspacePattern}";
+            var regex = new Regex(pattern);
+
+            var match = regex.Match(projectDescription);
+
+            if (match.Success)
+            {
+                return projectDescription.Replace(match.Value, "");
+            }
+            else
+            {
+                return projectDescription;
+            }
+
+        }
+
+
+
+    }
+}

C#/Regular Expression/README.md

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+# C# Regular Expression
+- regular expression or regex are pattern matching standard for string parsing and replacement
+
+# Resources
+- [Regular Expression in C#](https://www.c-sharpcorner.com/UploadFile/955025/regular-expression-in-C-Sharp/)
+- [Regular Expression Language - Quick Reference](https://docs.microsoft.com/en-us/dotnet/standard/base-types/regular-expression-language-quick-reference)