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  1. or download this
    # regex to add a comma after each char
# i believe you can think of it starting
...
# the () are required to capture each character
$show_choices =~ s/(?<=.)/,/g;
$show_choices =~ s/,$//g;       # remove the last comma
  2. or download this
    $show_choices =~ s/(.)/$1,/g;
  3. or download this
    $show_choices =~ s/(.)(?!$)/$1,/g;