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  1. or download this
    use YAPE::Regex::Explain;
    
    print YAPE::Regex::Explain->new(qr/(^USA|BRA|CAN)?(.*?)(XY)?$/)->expla
    +in();
    
  2. or download this
    The regular expression:
    
    (?-imsx:(^USA|BRA|CAN)?(.*?)(XY)?$)
    ...
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    )                        end of grouping
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