control-C<W>. This is better than typing a literal control-C<W>
into your program.
-Since Perl 5.6, Perl variable names may be alphanumeric
+Since Perl v5.6.0, Perl variable names may be alphanumeric
strings that begin with control characters (or better yet, a caret).
These variables must be written in the form C<${^Foo}>; the braces
are not optional. C<${^Foo}> denotes the scalar variable whose
=back
As C<$_> is a global variable, this may lead in some cases to unwanted
-side-effects. As of perl 5.10, you can now use a lexical version of
+side-effects. As of perl v5.10.0, you can now use a lexical version of
C<$_> by declaring it in a file or in a block with C<my>. Moreover,
declaring C<our $_> restores the global C<$_> in the current scope.
If the program has been given to perl via the switches C<-e> or C<-E>,
C<$0> will contain the string C<"-e">.
-On Linux as of perl 5.14 the legacy process name will be set with
+On Linux as of perl v5.14.0 the legacy process name will be set with
C<prctl(2)>, in addition to altering the POSIX name via C<argv[0]> as
perl has done since version 4.000. Now system utilities that read the
legacy process name such as ps, top and killall will recognize the
If your system has the C<sigaction()> function then signal handlers
are installed using it. This means you get reliable signal handling.
-The default delivery policy of signals changed in Perl 5.8.0 from
+The default delivery policy of signals changed in Perl v5.8.0 from
immediate (also known as "unsafe") to deferred, also known as "safe
signals". See L<perlipc> for more information.
The revision, version, and subversion of the Perl interpreter,
represented as a C<version> object.
-This variable first appeared in perl 5.6.0; earlier versions of perl
-will see an undefined value. Before perl 5.10.0 C<$^V> was represented
+This variable first appeared in perl v5.6.0; earlier versions of perl
+will see an undefined value. Before perl v5.10.0 C<$^V> was represented
as a v-string.
C<$^V> can be used to determine whether the Perl interpreter executing
See also C<$]> for an older representation of the Perl version.
-This variable was added in Perl 5.6.
+This variable was added in Perl v5.6.0.
Mnemonic: use ^V for Version Control.
L<perlrun|perlrun/"Command Switches"> for more information about site
customization.
-This variable was added in Perl 5.10.
+This variable was added in Perl v5.10.0.
=item $EXECUTABLE_NAME
modules can help you find uses of these
problematic match variables in your code.
-Since Perl 5.10, you can use the C</p> match operator flag and the
+Since Perl v5.10.0, you can use the C</p> match operator flag and the
C<${^PREMATCH}>, C<${^MATCH}>, and C<${^POSTMATCH}> variables instead
so you only suffer the performance penalties.
The use of this variable anywhere in a program imposes a considerable
performance penalty on all regular expression matches. To avoid this
penalty, you can extract the same substring by using L</@->. Starting
-with Perl 5.10, you can use the C</p> match flag and the C<${^MATCH}>
+with Perl v5.10.0, you can use the C</p> match flag and the C<${^MATCH}>
variable to do the same thing for particular match operations.
This variable is read-only and dynamically-scoped.
to return a defined value when the pattern was compiled or executed with
the C</p> modifier.
-This variable was added in Perl 5.10.
+This variable was added in Perl v5.10.0.
This variable is read-only and dynamically-scoped.
The use of this variable anywhere in a program imposes a considerable
performance penalty on all regular expression matches. To avoid this
penalty, you can extract the same substring by using L</@->. Starting
-with Perl 5.10, you can use the C</p> match flag and the
+with Perl v5.10.0, you can use the C</p> match flag and the
C<${^PREMATCH}> variable to do the same thing for particular match
operations.
to return a defined value when the pattern was compiled or executed with
the C</p> modifier.
-This variable was added in Perl 5.10
+This variable was added in Perl v5.10.0
This variable is read-only and dynamically-scoped.
The use of this variable anywhere in a program imposes a considerable
performance penalty on all regular expression matches.
To avoid this penalty, you can extract the same substring by
-using L</@->. Starting with Perl 5.10, you can use the C</p> match flag
+using L</@->. Starting with Perl v5.10.0, you can use the C</p> match flag
and the C<${^POSTMATCH}> variable to do the same thing for particular
match operations.
to return a defined value when the pattern was compiled or executed with
the C</p> modifier.
-This variable was added in Perl 5.10.
+This variable was added in Perl v5.10.0.
This variable is read-only and dynamically-scoped.
By setting and then using C<$var> in this way relieves you from having to
worry about exactly which numbered set of parentheses they are.
-This variable was added in Perl 5.8.
+This variable was added in Perl v5.8.0.
Mnemonic: the (possibly) Nested parenthesis that most recently closed.
how many subgroups were in the last successful match. See the
examples given for the C<@-> variable.
-This variable was added in Perl 5.6.
+This variable was added in Perl v5.6.0.
=item %LAST_PAREN_MATCH
Likewise, if the last successful match changes, then the results may be
surprising.
-This variable was added in Perl 5.10.
+This variable was added in Perl v5.10.0.
This variable is read-only and dynamically-scoped.
=back
-This variable was added in Perl 5.6.
+This variable was added in Perl v5.6.0.
=item %LAST_MATCH_START
Likewise, if the last successful match changes, then the results may be
surprising.
-This variable was added in Perl 5.10
+This variable was added in Perl v5.10.0.
This variable is read-only and dynamically-scoped.
The current value of the regex debugging flags. Set to 0 for no debug output
even when the C<re 'debug'> module is loaded. See L<re> for details.
-This variable was added in Perl 5.10.
+This variable was added in Perl v5.10.0.
=item ${^RE_TRIE_MAXBUF}
X<${^RE_TRIE_MAXBUF}>
negative value to prevent the optimisation and conserve the most memory.
Under normal situations this variable should be of no interest to you.
-This variable was added in Perl 5.10.
+This variable was added in Perl v5.10.0.
=back
Under VMS this reflects the actual VMS exit status; i.e. it is the
same as C<$?> when the pragma C<use vmsish 'status'> is in effect.
-This variable was added in Perl 5.8.9.
+This variable was added in Perl v5.10.0.
=item $EXTENDED_OS_ERROR
values are considered internal to the L<warnings> pragma and may change
between versions of Perl.
-This variable was added in Perl 5.6.
+This variable was added in Perl v5.6.0.
=item $OS_ERROR
time rather than normal, deferred loading. Setting
C<$^C = 1> is similar to calling C<B::minus_c>.
-This variable was added in Perl 5.6.
+This variable was added in Perl v5.6.0.
=item $DEBUGGING
name of its main package) and a "/" character. For example, a module
C<Foo::Bar> should use keys such as C<Foo::Bar/baz>.
-This variable was added in Perl 5.6.
+This variable was added in Perl v5.6.0.
=item ${^OPEN}
X<${^OPEN}>
by a C<\0> byte, the first part describes the input layers, the second
part describes the output layers.
-This variable was added in Perl 5.8.0.
+This variable was added in Perl v5.8.0.
=item $PERLDB
This variable is read-only.
-This variable was added in Perl 5.8.
+This variable was added in Perl v5.8.0.
=item ${^UNICODE}
X<${^UNICODE}>
This variable is set during Perl startup and is thereafter read-only.
-This variable was added in Perl 5.8.2.
+This variable was added in Perl v5.8.2.
=item ${^UTF8CACHE}
X<${^UTF8CACHE}>
1 for on (the default), 0 for off, -1 to debug the caching code by checking
all its results against linear scans, and panicking on any discrepancy.
-This variable was added in Perl 5.8.9.
+This variable was added in Perl v5.8.9.
=item ${^UTF8LOCALE}
X<${^UTF8LOCALE}>
adjust-utf8ness-to-locale mode (as when run with the C<-CL> command-line
switch); see L<perlrun> for more info on this.
-This variable was added in Perl 5.8.8.
+This variable was added in Perl v5.8.8.
=back
X<$#> X<$OFMT>
C<$#> was a variable that could be used to format printed numbers.
-After a deprecation cycle, its magic was removed in Perl 5.10 and
+After a deprecation cycle, its magic was removed in Perl v5.10.0 and
using it now triggers a warning: C<$# is no longer supported>.
This is not the sigil you use in front of an array name to get the
Deprecated in Perl 5.
-Removed in Perl 5.10.
+Removed in Perl v5.10.0.
=item $*
X<$*>
C<$*> was a variable that you could use to enable multiline matching.
-After a deprecation cycle, its magic was removed in Perl 5.10.
+After a deprecation cycle, its magic was removed in Perl v5.10.0.
Using it now triggers a warning: C<$* is no longer supported>.
You should use the C</s> and C</m> regexp modifiers instead.
Deprecated in Perl 5.
-Removed in Perl 5.10.
+Removed in Perl v5.10.0.
=item $ARRAY_BASE
(That's why you can only assign compile-time constants to it.)
Its use is highly discouraged.
-Prior to Perl 5.10, assignment to C<$[> could be seen from outer lexical
+Prior to Perl v5.10.0, assignment to C<$[> could be seen from outer lexical
scopes in the same file, unlike other compile-time directives (such as
L<strict>). Using local() on it would bind its value strictly to a lexical
block. Now it is always lexically scoped.
-As of Perl
5.16, it is implemented by the L<arybase> module. See
+As of Perl
v5.16.0, it is implemented by the L<arybase> module. See
L<arybase> for more details on its behaviour.
Under C<use v5.16>, or C<no feature "array_base">, C<$[> no longer has any
Mnemonic: [ begins subscripts.
-Deprecated in Perl 5.12.
+Deprecated in Perl v5.12.0.
=item $OLD_PERL_VERSION
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