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| author | Steve Peters <steve@fisharerojo.org> | 2005-05-11 16:58:22 +0000 |
|---|---|---|
| committer | Abhijit Menon-Sen <ams@wiw.org> | 2005-05-11 16:57:27 +0000 |
| commit | 52ea55c9ee04ef3b03dd13373eda27b47fea1087 (patch) | |
| tree | 1895a659aa695f9993ea33ea273ac484715672a3 /pod | |
| parent | e800eb2ef64b60f7fef69c20beaa3589a131c1c8 (diff) | |
| download | perl-52ea55c9ee04ef3b03dd13373eda27b47fea1087.tar.gz | |
[perl #33765] [PATCH] perlop: mention why 'print !!0' doesn't
From: Steve Peters via RT <perlbug-followup@perl.org>
Date: 11 May 2005 16:58:22 -0000
Message-Id: <rt-3.0.11-33765-112475.14.5633321030279@perl.org>
Subject: [perl #33766] [PATCH] perldoc -f split lacks basic null example
From: Steve Peters via RT <perlbug-followup@perl.org>
Date: 11 May 2005 17:13:29 -0000
Message-Id: <rt-3.0.11-33766-112476.1.84217630998887@perl.org>
p4raw-id: //depot/perl@24449
Diffstat (limited to 'pod')
| -rw-r--r-- | pod/perlfunc.pod | 16 | ||||
| -rw-r--r-- | pod/perlsyn.pod | 3 |
2 files changed, 14 insertions, 5 deletions
diff --git a/pod/perlfunc.pod b/pod/perlfunc.pod index 81a42c2ab3..d7b9bfa683 100644 --- a/pod/perlfunc.pod +++ b/pod/perlfunc.pod @@ -5079,12 +5079,18 @@ produces the output 'h:i:t:h:e:r:e'. Using the empty pattern C<//> specifically matches the null string, and is not be confused with the use of C<//> to mean "the last successful pattern -match". +match". So, for C<split>, the following are equivalent: -Empty leading (or trailing) fields are produced when there are positive width -matches at the beginning (or end) of the string; a zero-width match at the -beginning (or end) of the string does not produce an empty field. For -example: + print join(':', split(//, 'hi there')); + + print join(':', split('', 'hi there')); + +and they produce the output 'h:i: :t:h:e:r:e'. + +Empty leading (or trailing) fields are produced when there are positive +width matches at the beginning (or end) of the string; a zero-width match +at the beginning (or end) of the string does not produce an empty field. +For example: print join(':', split(/(?=\w)/, 'hi there!')); diff --git a/pod/perlsyn.pod b/pod/perlsyn.pod index aabd65d212..3d45d55f52 100644 --- a/pod/perlsyn.pod +++ b/pod/perlsyn.pod @@ -105,6 +105,9 @@ as the last item in a statement. The number 0, the strings C<'0'> and C<''>, the empty list C<()>, and C<undef> are all false in a boolean context. All other values are true. +Negation of a true value by C<!> or C<not> returns a special false value. +When evaluated as a string it is treated as C<''>, but as a number, it +is treated as 0. =head2 Statement Modifiers |