#18155: Regex-escape delimiter, in case it is a regex special char.

Patch by Vajrasky Kok, with slight modification to the tests by me.
diff --git a/Misc/ACKS b/Misc/ACKS
index f8e588e..67f0c97 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -545,6 +545,7 @@
 Greg Kochanski
 Damon Kohler
 Marko Kohtala
+Vajrasky Kok
 Guido Kollerie
 Peter A. Koren
 Joseph Koshy