19:40 >perl -wE "my $s = 'abCdefC'; while ($s =~ / (f)*? C /gx) { say qq[match: $1, pos = ], pos $s; }"
Use of uninitialized value $1 in concatenation (.) or string at -e line 1.
match: , pos = 3
match: f, pos = 7

19:41 >