I can confirm that this formula works fine with regular expressions enabled. Of course, it will fail if the strings have trailing spaces after the last "F".
tohuwawohu ( 2012-07-16 11:13:12 +0200 )editPinging @jorendc: Could you please lend your mac-testing skills to this question? Please let us know if mariosv's Answer seems to work. If it acts differently on different OSes, then this question gets a free trip to you-know-where! (no, not Mordor... although it's about as scary to some users ;-)
qubit ( 2013-02-20 05:53:53 +0200 )edit

Yes, regular expressions are enabled. As a result countit based on the first character works for example =countif(A2:A12,"W.*") returns 1 but countif based on the last character does not.
Farmer Bob ( 2012-07-16 03:45:08 +0200 )edit