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print substr($String, 0, 10);

timethese(1000000, {
  pack   => q{ my $String = 'Russ is a stud'; $String = pack("A10", $S
+tring)},
  substr => q{ my $String = 'Russ is a stud'; $String = substr($String
+, 0, 10)}
});

Benchmark: timing 1000000 iterations of pack, substr...
      pack:  7 wallclock secs ( 7.20 usr +  0.00 sys =  7.20 CPU)
    substr:  6 wallclock secs ( 6.67 usr +  0.01 sys =  6.68 CPU)