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  1. or download this
    $def1 = "!defined(FLOAT_CODE)";
$def2 = "defined(FIXED_CODE)";
  2. or download this
     
m/^(!defined|defined)\((.*?)\)$/;
print "$1----$2\n";
  3. or download this
     
output case1: !defined----FLOAT_CODE 
output case2: defined----FIXED_CODE
  4. or download this
    m/^(\!|defined)(.*?)$/;
print "$1----$2\n";
  5. or download this
    output case1: !----defined(FLOAT_CODE)
output case2: defined----(FIXED_CODE)