Here I reset 'pos' when match approaches the end of the pattern, allowing second regex always match:
#!/usr/bin/perl
# https://perlmonks.org/?node_id=1227147
use warnings;
use strict;
my $pattern = 'FTTF';
my @result = grep {
$pattern =~ /(?!$)/g;
$pattern =~ /./g;
$& eq 'T'
} 0 .. 12;
print "@result\n";
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