=item Keywords related to the control flow of your Perl program
X<control flow>
-C<caller>, C<continue>, C<die>, C<do>, C<dump>, C<eval>, C<exit>,
+C<caller>, C<continue>, C<die>, C<do>,
+C<dump>, C<eval>, C<evalbytes> C<exit>,
C<__FILE__>, C<goto>, C<last>, C<__LINE__>, C<next>, C<__PACKAGE__>,
-C<redo>, C<return>, C<sub>, C<wantarray>,
+C<redo>, C<return>, C<sub>, C<__SUB__>, C<wantarray>
+
+C<__SUB__> is only available with a C<use v5.16> (or higher) declaration or
+with the C<"current_sub"> feature (see L<feature>).
=item Keywords related to the switch feature
=item Miscellaneous functions
-C<defined>, C<dump>, C<eval>, C<formline>, C<local>, C<my>, C<our>,
+C<defined>, C<dump>, C<eval>, C<evalbytes>,
+C<formline>, C<local>, C<my>, C<our>,
C<reset>, C<scalar>, C<state>, C<undef>, C<wantarray>
=item Functions for processes and process groups
If EXPR is omitted, evaluates C<$_>. This form is typically used to
delay parsing and subsequent execution of the text of EXPR until run time.
+If the C<unicode_eval> feature is enabled (which is the default under a
+C<use 5.16> or higher declaration), EXPR or C<$_> is treated as a string of
+characters, so C<use utf8> declarations have no effect, and source filters
+are forbidden. In the absence of the C<unicode_eval> feature, the string
+will sometimes be treated as characters and sometimes as bytes, depending
+on the internal encoding, and source filters activated within the C<eval>
+exhibit the erratic, but historical, behaviour of affecting some outer file
+scope that is still compiling. See also the L</evalbytes> keyword, which
+always treats its input as a byte stream and works properly with source
+filters, and the L<feature> pragma.
+
In the second form, the code within the BLOCK is parsed only once--at the
same time the code surrounding the C<eval> itself was parsed--and executed
within the context of the current Perl program. This form is typically
of code that called it. You don't normally need to worry about this unless
you are writing a Perl debugger.
+=item evalbytes EXPR
+X<evalbytes>
+
+=item evalbytes
+
+This function is like L</eval> with a string argument, except it always
+parses its argument, or C<$_> if EXPR is omitted, as a string of bytes. A
+string containing characters whose ordinal value exceeds 255 results in an
+error. Source filters activated within the evaluated code apply to the
+code itself.
+
+This function is only available under the C<evalbytes> feature, a
+C<use v5.16> (or higher) declaration, or with a C<CORE::> prefix. See
+L<feature> for more information.
+
=item exec LIST
X<exec> X<execute>
each segment as separate pattern. As such, C<glob("*.c *.h")>
matches all files with a F<.c> or F<.h> extension. The expression
C<glob(".* *")> matches all files in the current working directory.
+If you want to glob filenames that might contain whitespace, you'll
+have to use extra quotes around the spacey filename to protect it.
+For example, to glob filenames that have an C<e> followed by a space
+followed by an C<f>, use either of:
+
+ @spacies = <"*e f*">;
+ @spacies = glob '"*e f*"';
+ @spacies = glob q("*e f*");
+
+If you had to get a variable through, you could do this:
+
+ @spacies = glob "'*${var}e f*'";
+ @spacies = glob qq("*${var}e f*");
If non-empty braces are the only wildcard characters used in the
C<glob>, no filenames are matched, but potentially many strings
references; see L<attributes> and L<Attribute::Handlers> for more
information about attributes.
+=item __SUB__
+X<__SUB__>
+
+A special token that returns the a reference to the current subroutine, or
+C<undef> outside of a subroutine.
+
+This token is only available under C<use v5.16> or the "current_sub"
+feature. See L<feature>.
+
=item substr EXPR,OFFSET,LENGTH,REPLACEMENT
X<substr> X<substring> X<mid> X<left> X<right>
https://perl5.git.perl.org / perl5.git / blobdiff