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  1. or download this
    use YAPE::Regex::Explain;
    print YAPE::Regex::Explain->new(qr/^(?:(?:\d+|\d+-\d+|a)(,\s*|$))+$/)-
    +>explain;
    
  2. or download this
    The regular expression:
    
    ...
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    )                        end of grouping
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