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use strict;
use warnings;
...
    substr $masked, $_, 1, q{x} for @toMask;
    return $masked;
}

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              Rate  substrList    andRegex andOrAndNot
substrList  26.0/s          --         -8%        -91%
andRegex    28.3/s          9%          --        -90%
andOrAndNot  278/s        969%        884%          --