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

[download]

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...

In reply to Re: Insert comma after every character by chuckbutler
in thread Insert comma after every character by bgaber

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