The $replacecs looks weird and out of order, I don\'t really see why you hard coded an acronym in your code. You say: \"Note: The acronyms thank you and no problem are already inputed in the main part of the alias do to regex\'s case sensitive nature\". Well, the truth is, regex is as case (in)sensitive as you specify it to be. If you use the /i switch, it will make the check case insensitive, which is probably what you are looking for.