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my %validate = (
     INT => qr /^[+-]?\d+$/,
     DEC => qr /^[+-]?\d*\.?\d*$/,
     #etc.
);

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my %actions = (
     INT => sub { return 1 if $_[0] =~ /^[+-]?\d+$/},
     DEC => sub { return 1 if $_[0] =~ /^[+-]?\d*\.?\d*$/},
     VARCHAR(5)=> \&validate_varchar_5(@_),
     #etc.
);