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  1. or download this
    my $re1=qr/foo$/;  
    my $re2=qr/foo$/m;
    ...
    (?^:(?^:foo$)$) F    (?^m:(?^:foo$)$) F
    (?^m:foo$) T         (?^m:foo$) T
    (?^:(?^m:foo$)$) F   (?^m:(?^m:foo$)$) T