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| author | Jarkko Hietaniemi <jhi@iki.fi> | 2003-06-17 13:12:21 +0000 |
|---|---|---|
| committer | Jarkko Hietaniemi <jhi@iki.fi> | 2003-06-17 13:12:21 +0000 |
| commit | 665e98b9987fe678dd115b56e9f0c9eb6bba0f1e (patch) | |
| tree | 0e71dd436ef026602cc4fdfbdf63d1f873fb3c7a /pod/perlre.pod | |
| parent | 7d4807dba83f8253564940c8bb1fc36759e49187 (diff) | |
| download | perl-665e98b9987fe678dd115b56e9f0c9eb6bba0f1e.tar.gz | |
DOCPATCH Re: $1 remains uncleared for failed matches
From: david nicol <whatever@davidnicol.com>
Date: 16 Jun 2003 20:35:24 -0500
Message-Id: <1055813724.1580.19.camel@plaza.davidnicol.com>
Subject: Re: DOCPATCH Re: $1 remains uncleared for failed matches
From: Ronald J Kimball <rjk@linguist.Thayer.dartmouth.edu>
Date: Tue, 17 Jun 2003 00:12:04 -0400
Message-ID: <20030617041204.GA34960@linguist.thayer.dartmouth.edu>
p4raw-id: //depot/perl@19804
Diffstat (limited to 'pod/perlre.pod')
| -rw-r--r-- | pod/perlre.pod | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/pod/perlre.pod b/pod/perlre.pod index a11e3e833b..365cbb9aaa 100644 --- a/pod/perlre.pod +++ b/pod/perlre.pod @@ -394,11 +394,15 @@ the most-recently closed group (submatch). C<$^N> can be used in extended patterns (see below), for example to assign a submatch to a variable. -The numbered variables ($1, $2, $3, etc.) and the related punctuation +The numbered match variables ($1, $2, $3, etc.) and the related punctuation set (C<$+>, C<$&>, C<$`>, C<$'>, and C<$^N>) are all dynamically scoped until the end of the enclosing block or until the next successful match, whichever comes first. (See L<perlsyn/"Compound Statements">.) +B<NOTE>: failed matches in Perl do not reset the match variables, +which makes easier to write code that tests for a series of more +specific cases and remembers the best match. + B<WARNING>: Once Perl sees that you need one of C<$&>, C<$`>, or C<$'> anywhere in the program, it has to provide them for every pattern match. This may substantially slow your program. Perl |