slovo | definícia |
?? (foldoc) | ??
A Perl quote-like operator used to delimit a
regular expression (RE) like "?FOO?" that matches FOO at
most once. The normal "/FOO/" form of regular expression will
match FOO any number of times. The "??" operator will match
again after a call to the "reset" operator.
The operator is usually referred to as "??" but, taken
literally, an empty RE like this (or "//") actually means to
re-use the last successfully matched regular expression or, if
there was none, empty string (which will always match).
Unix manual page: perlop(1).
(2009-05-28)
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