perlexperiment - A listing of experimental features in Perl
This document lists the current and past experimental features in the perl core. Although all of these are documented with their appropriate topics, this succinct listing gives you an overview and basic facts about their status.
So far we've merely tried to find and list the experimental features and infer their inception, versions, etc. There's a lot of speculation here.
~~)Introduced in Perl 5.10.0
Modified in Perl 5.10.1, 5.12.0
Using this feature triggers warnings in the category experimental::smartmatch.
The ticket for this feature is [perl #119317].
The ticket for this feature is [perl #119455].
See "PL_keyword_plugin" in perlapi for the mechanism.
Introduced in Perl 5.11.2
Introduced in Perl 5.18
The ticket for this feature is [perl #119451].
See also: "Extended Bracketed Character Classes" in perlrecharclass
Using this feature triggers warnings in the category experimental::regex_sets.
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category experimental::refaliasing.
The ticket for this feature is [perl #122947].
See also: "Assigning to References" in perlref
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category experimental::re_strict.
The ticket for this feature is [perl #119453].
See also perlrun
Introduced in Perl 5.26.0
Using this feature triggers warnings in the category experimental::declared_refs.
The ticket for this feature is [perl #128654].
installhtml target in the Makefile.The ticket for this feature is [perl #116487].
Introduced in Perl 5.28.0
Using this feature triggers warnings in the category experimental::script_run.
See also: "Script Runs" in perlre
Introduced in Perl 5.28.0
Using this feature triggers warnings in the category experimental::alpha_assertions.
See also: "Extended Patterns" in perlre.
These features were so wildly successful and played so well with others that we decided to remove their experimental status and admit them as full, stable features in the world of Perl, lavishing all the benefits and luxuries thereof. They are also awarded +5 Stability and +3 Charisma.
Introduced in Perl 5.005
Introduced in Perl 5.005
Introduced in Perl 5.6.0
See also perldebug, perldebtut
Introduced in Perl 5.6.0
Introduced in Perl 5.6.0
Introduced in Perl 5.6.1
See also perlfork
Introduced in Perl 5.6.0
Accepted in Perl 5.8.0
Introduced in Perl 5.6.0
Accepted in Perl 5.8.1
\N regex character classThe \N character class, not to be confused with the named character sequence \N{NAME}, denotes any non-newline character in a regular expression.
Introduced in Perl 5.12
Exact version of acceptance unclear, but no later than Perl 5.18.
(?{code}) and (??{ code })Introduced in Perl 5.6.0
Accepted in Perl 5.20.0
See also perlre
Introduced in Perl 5.9.2
Accepted before Perl 5.20.0. The Socket library is now primarily maintained on CPAN, rather than in the perl core.
See also Socket
Introduced in Perl 5.6.0
Accepted in Perl 5.20.0
See also perlsub
(*ACCEPT)
Introduced in Perl 5.10
Accepted in Perl 5.20.0
See also perlrun
Accepted in Perl 5.20.0
\s in regexp matches vertical tabAccepted in Perl 5.22.0
Introduced in Perl 5.20.0
Accepted in Perl 5.24.0
Introduced in Perl 5.18.0
Accepted in Perl 5.26.0
$_Introduced in Perl 5.10.0
Accepted in cperl 5.24.0, removed in Perl 5.24.0.
Introduced in Perl 5.20.0
Accepted in cperl 5.24.0, still experimental in Perl.
Introduced in Perl 5.22.0 for subroutines only.
Accepted in cperl 5.24.0 for all data.
Introduced in Perl 5.22.0
Accepted in Perl 5.28.0
Introduced in Perl 5.16.0
Accepted in cperl 5.28.0
Introduced in Perl 5.16.0
Accepted in cperl 5.28.0
These features are no longer considered experimental and their functionality has disappeared. It's your own fault if you wrote production programs using these features after we explicitly told you not to (see perlpolicy).
Introduced in Perl 5.005
Removed in Perl 5.10
Introduced in Perl 5.005
Moved from Perl 5.9.0 to CPAN, accepted in cperl 5.22.1
Introduced in Perl 5.6.0
Removed in Perl 5.9.0
Getopt::Long upgraded to version 2.35
Removed in Perl 5.8.8
The -A command line switch
Introduced in Perl 5.9.0
Removed in Perl 5.9.5
Moved from Perl 5.10.1 to CPAN
legacyThe experimental legacy pragma was swallowed by the feature pragma.
Introduced in Perl 5.11.2
Removed in Perl 5.11.3
our can have an experimental optional attribute uniqueIntroduced in Perl 5.8.0
Deprecated in Perl 5.10.0
Removed in Perl 5.28.0
$_Using this feature triggered warnings in the category experimental::lexical_topic.
Introduced in Perl 5.10.0
Removed in Perl 5.24.0, but kept and fixed in cperl 5.24.0
Using this feature triggered warnings in the category experimental::autoderef.
Superseded by "Postfix dereference syntax".
Introduced in Perl 5.14.0
Removed in Perl 5.24.0
our can have an experimental optional attribute uniqueIntroduced in Perl 5.8.0
Deprecated in Perl 5.10.0
Removed in Perl 5.28.0
For a complete list of features check feature.
brian d foy <brian.d.foy@gmail.com>
Sébastien Aperghis-Tramoni <saper@cpan.org>
Copyright 2010, brian d foy <brian.d.foy@gmail.com>
You can use and redistribute this document under the same terms as Perl itself.