To: perl5-porters@perl.org
Message-Id: <Pine.LNX.4.10.
9910131546580.3542-100000@localhost.localdomain>
p4raw-id: //depot/cfgperl@4367
right argument is an expression rather than a search pattern,
substitution, or transliteration, it is interpreted as a search pattern at run
time. This can be is less efficient than an explicit search, because the
-pattern must be compiled every time the expression is evaluated.
+pattern must be compiled every time the expression is evaluated).
Binary "!~" is just like "=~" except the return value is negated in
the logical sense.