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  1. or download this
               +------------ Matched at pos 0.
           |   +-------- Matched at pos 1.
...
           |   || |||
           v   vv vvv
'abcd' =~ /a(?!BC)..d/  # Matches
  2. or download this
    my $s = 'abcd';
$s =~ s/a(?=bc)/x/;  # xbcd

my $s = 'aefg';
$s =~ s/a(?=bc)/x/;  # abcd