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  1. or download this
    c:\>perl -le "print $_, qq(\t), /\.[docx|pdf]$/ ||0 for qw(.pdf .docx 
    +.p .d .f .d .o .c .x .|);"
    .pdf    0
    ...
    .c      1
    .x      1
    .|      1
    
  2. or download this
    c:\>perl -le "print $_, qq(\t), /\.(?:docx|pdf)$/ ||0 for qw(.pdf .doc
    +x .p .d .f .d .o .c .x .|);"
    .pdf    1
    ...
    .c      0
    .x      0
    .|      0