Initial data commit

Task/Regular-expressions/C-sharp/regular-expressions.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Text.RegularExpressions;
+
+class Program {
+    static void Main(string[] args) {
+        string str = "I am a string";
+
+        if (new Regex("string$").IsMatch(str)) {
+            Console.WriteLine("Ends with string.");
+        }
+
+        str = new Regex(" a ").Replace(str, " another ");
+        Console.WriteLine(str);
+    }
+}