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  1. or download this
    perl -Mre=debug -e "qr/a .{1,10} \ /x;qr/a .{1,10} [ ]/x;"
  2. or download this
    Compiling REx "a .{1,10} \ "
Final program:
...
   5:   REG_ANY (0)
   6: EXACT < > (8)
   8: END (0)
  3. or download this
                Rate literal   class
literal 531978/s      --     -1%
class   539600/s      1%      --