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$_ = '1 the cat sat on the mat.';
tr/abcdefghijklmnopqrstuvwxyz0-9/aBCDEFGHIJKLMNOPQRSTUVWXYZ/d;
...
__END__
 THE CaT SaT ON THE MaT.
 THE CiT SiT ON THE MiT.

tr/searchlist0123456789
  /REPLACEMENTLIST/d