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  1. or download this
    #!/usr/bin/perl
use warnings;
...
  
NODE                     EXPLANATION
------------------------------------------------------------BLAH BLAH 
+BLAH
  2. or download this
    $thing=~/(?-imsx:(?:(?i)(?:[+-]?)(?:(?=[0123456789]|[.])(?:[0123456789
+]*)(?:(?:[.])(?:[0123456789]{0,}))?)(?:(?:[E])(?:(?:[+-]?)(?:[0123456
+789]+))|)))
/