Can't confirm your observations:
use Benchmark qw( cmpthese );
$_ = '
df asdf sadf s f
df asdf sadf s f
df asdf sadf s f
df asdf sadf s f
df asdf sadf s f
df asdf sadf s f
df asdf sadf s f
df asdf sadf s f
';
our $KEY="df";
cmpthese(-3, {
caret => '/^ \s* $KEY /mx',
cr => '/\n \s* $KEY /mx',
});
Result
Rate caret cr
cr 1118569/s -- -1%
caret 1133366/s 1% --
s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e
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