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/^(?=.*[A-Za-z])(?=.*[0-9])[A-Za-z0-9]{3,10}\z/

/^[A-Za-z0-9]{3,10}\z/ && /[A-Za-z]/ && /[0-9]/

/^(?=[A-Za-z0-9]{3,10}\z).*(?:[0-9][A-Za-z]|[A-Za-z][0-9])/

/(?>(?:[0-9][A-Za-z]|[A-Za-z][0-9]).*\z)(?(?{pos()<3||pos()>10})(?!))/

----------------------------------------
Short (arg: 2j)
...
ikegami1  746/ms     376%       --     -45%     -45%
ikegami3 1351/ms     762%      81%       --      -1%
ikegami2 1365/ms     770%      83%       1%       --

use strict;
use warnings;
...
   print("Multiply by $INNER to get real rate\n");
   print("\n");
}