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  1. or download this
        $a =~ /\d\d\.\d\d/ || $a =~ /\$\d\d\d\.\d\d\d/ || $a =~ /\$\.\d\d/
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        $a =~ /\d\d\.\d\d/ || $a =~ /\$\.\d\d/;
  3. or download this
        $a =~ /(?:\d\d|\$)\.\d\d/;