in reply to Insert comma after every character

If the result is to have a comma after each character, save the last one:

$perl -we "($_='FBD') =~ s/(.)(?!$)/$1,/g; print;" ~~Output~~ F,B,D

the assertion of any character with a zero assertion of not at the end of line should do fine.

Good luck. -c

Update: fixed typo...