Why (?!cat) can still match 'cattle'?

yybmsrs

I see.Thanks everyone.

hu145165

print "ok\n" if('abc'=~/^(?!abc)$/);
print "ok\n" if('abc'=~/(?!abc)/);

blackold

断言

churchmice

perldoc perlre 好好看一遍，这些个里面都有说

use strict;
use warnings;
$_ = "cattle";
/(?!cat)(?{ print "$`'$&$'"})/;