Question

I’m looking for a C# snippet to remove and store any punctuation from the end of a string only.

Example:

• Test! would return !
• Test;; would return ;;

• Test?:? would return ?:?

• !!Test!?! would return !?!

I have a rather clunky solution at the moment but wondered if anybody could suggest a more succinct way to do this.

My puncutation list is

new char[] { '.', ':', '-', '!', '?', ',', ';' })

Answer 1

Using Linq:

var punctuationMap = new HashSet<char>(new char[] { '.', ':', '-', '!', '?', ',', ';' });
var endPunctuationChars = aString.Reverse().
                                  TakeWhile(ch => punctuationMap.Contains(ch));
var result = new string(endPunctuationChars.Reverse().ToArray());

The HashSet is not mandatory, you can use Linq’s Contains on the array directly.