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  1. or download this
    use re 'debug';

...
   print("***** $_ *****\n");
   /$re_str/;
}
  2. or download this
    ***** 1 *****
Compiling REx `1'
...

***** 4 *****
Matching REx "\d" against "4"     <--- No "Compiling" before this.