while (<DATA>) {
chomp;
if (! /([smtwhfa])(?=.*?\1)/) {
print "$_ : OK\n";
} else {
print "$_ : Not OK\n";
}
}
__DATA__
smsa
smta
stmwhas
And the output -
smsa : Not OK
smta : OK
stmwhas : Not OK
Update: Ah! Thanks people for pointing out that my regex didn't check for non-allowed characters. bart's solution is perfect.
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