Extract file extension: Difference between revisions

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@@ Line 347: / Line 347: @@
         break;
     }
+    //The dot must be followed by at least one other character,
-    return filename.Substring(indexOfDot);
+    //so if the last character is a dot, return the empty string
+    return indexOfDot + 1 == filename.Length ? "" : filename.Substring(indexOfDot);
 }</lang>
+'''Using regular expressions (C# 6)'''
+<lang [[C sharp|C#]]>public static string FindExtension(string filename) => Regex.Match(filename, @"\.[A-Za-z0-9]+$").Value;</lang>
 =={{header|Emacs Lisp}}==