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  1. or download this
    #! perl
    use strict;
    use YAPE::Regex::Explain;
    print YAPE::Regex::Explain->new(shift)->explain;
    
  2. or download this
    tilly@localhost:~$ perl re-explain foo    
    The regular expression:
    ...
    ----------------------------------------------------------------------
    )                        end of grouping
    ----------------------------------------------------------------------