Here's a solution based on a hash/regex combo:
my $chars = "abc";
foreach (qw/abc bca cab cba bac acb aab abbc acc/) {
my %seen;
my $pat = $_;
$pat =~ s/([\Q$chars\E])/++$seen{$1}/gex;
if ((grep {$_ == 1} values %seen) == length($chars)) {
print "$_ matches\n";
}
else{
print "$_ doesn't match\n";
}
}
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