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  1. or download this
    # warning win32 doublequotes oneliner                 
    perl -e " print $1 if $ARGV[0]=~/(AAA)[^AX].+XXX/"    ABBBAAACCCXXX
    AAA
    
  2. or download this
    perl -MYAPE::Regex::Explain -e " print YAPE::Regex::Explain->new(qr/(A
    +AA)[^AX].+XXX/)->explain(); "
    The regular expression:
    ...
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    )                        end of grouping
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