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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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