Using tr
There are four "r"s in this sentence. 4
Still, rrrr makes no sense. 4
There are four "r"s in this sentence. 4
Still, rrrr makes no sense. 4
Argh. right you are, randy! 4 matches if insensitive but only 2 match when case sensitive.

         using match:
There are four "r"s in this sentence. 4
Still, rrrr makes no sense. 4
There are four "r"s in this sentence. 4
Still, rrrr makes no sense. 4
Argh. Right you are, Randy! 4 matches if insensitive but only 2 match when case sensitive.

         using match2:
There are four "r"s in this sentence. 4
Still, rrrr makes no sense. 4
There are four "r"s in this sentence. 4
Still, rrrr makes no sense. 4
Argh. Right you are, Randy! 4 matches if insensitive but only 2 match when case sensitive.

 and the data is: ....