sub compare {
    (my $xor=$_[0]^$_[1]) =~ tr/\0//d;
    length $xor < 2;
}

[download]
Untested. And not benchmarked. But that would be my first try at doing what you need.

In reply to Re: Tell whether two strings differ at only one position by blazar
in thread Tell whether two strings differ at only one position by rg0now

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