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 experiment is [perl #13173].
Introduced in Perl 5.11.2
See "PL_keyword_plugin" in perlapi for the mechanism.
The ticket for this experiment is [perl #13199].
Introduced in Perl 5.18
Using this feature triggers warnings in the category experimental::regex_sets.
The ticket for this experiment is [perl #13197].
See also: "Extended Bracketed Character Classes" in perlrecharclass
Introduced in Perl 5.20.0
Using this feature triggers warnings in the category experimental::signatures.
The ticket for this experiment is [perl #13681].
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category experimental::refaliasing.
The ticket for this experiment is [perl #14150].
See also: "Assigning to References" in perlref
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category experimental::const_attr.
The ticket for this experiment is [perl #14428].
See also: "Constant Functions" in perlsub
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category experimental::re_strict.
The ticket for this experiment is [perl #18755]
Using this feature triggers warnings in the category experimental::win32_perlio.
The ticket for this experiment is [perl #13198].
See also "PERLIO" in perlrun
Introduced in Perl 5.26.0
Using this feature triggers warnings in the category experimental::declared_refs.
The ticket for this experiment is [perl #15458].
installhtml target in the Makefile.The ticket for this experiment is [perl #12726].
Introduced in Perl 5.30.0.
Variability of up to 255 characters is handled.
Using this feature triggers warnings in the category experimental::vlb.
The ticket for this experiment is [perl #18756].
See also: "(*positive_lookbehind:pattern)" in perlre and "(*negative_lookbehind:pattern)" in perlre
Introduced in Perl 5.30.0.
This feature is part of an interface intended for internal and experimental use by the perl5 developers. You are unlikely to encounter it in the wild.
Using this feature triggers warnings in the category experimental::private_use.
The ticket for this experiment is [perl #18758].
Introduced in Perl 5.30.0.
This feature allows regular expression matching against Unicode character properties to be expressed more concisely.
Using this feature triggers warnings in the category experimental::uniprop_wildcards.
The ticket for this experiment is [perl #18759].
Introduced in Perl 5.32.0.
Using this feature triggers warnings in the category experimental::isa.
The ticket for this experiment is [perl #18754]
Introduced in Perl 5.34.0.
Using this feature triggers warnings in the category experimental::try.
The ticket for this experiment is [perl #18760]
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 "PERLIO" in 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 5.22.0
Accepted in Perl 5.28.0
Introduced in Perl 5.28.0
Accepted in Perl 5.32.0
Introduced in Perl 5.28.0
Accepted in Perl 5.32.0
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
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
$_Using this feature triggered warnings in the category experimental::lexical_topic.
Introduced in Perl 5.10.0
Removed in Perl 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.