GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages
PERLEXPERIMENT(1) Perl Programmers Reference Guide PERLEXPERIMENT(1)

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.

Smart match ("~~")
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] <https://github.com/Perl/perl5/issues/13173>.

Pluggable keywords
Introduced in Perl 5.11.2

See "PL_keyword_plugin" in perlapi for the mechanism.

The ticket for this experiment is [perl #13199] <https://github.com/Perl/perl5/issues/13199>.

Regular Expression Set Operations
Introduced in Perl 5.18

Using this feature triggers warnings in the category "experimental::regex_sets".

The ticket for this experiment is [perl #13197] <https://github.com/Perl/perl5/issues/13197>.

See also: "Extended Bracketed Character Classes" in perlrecharclass

Subroutine signatures
Introduced in Perl 5.20.0

Using this feature triggers warnings in the category "experimental::signatures".

The ticket for this experiment is [perl #13681] <https://github.com/Perl/perl5/issues/13681>.

Aliasing via reference
Introduced in Perl 5.22.0

Using this feature triggers warnings in the category "experimental::refaliasing".

The ticket for this experiment is [perl #14150] <https://github.com/Perl/perl5/issues/14150>.

See also: "Assigning to References" in perlref

The "const" attribute
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] <https://github.com/Perl/perl5/issues/14428>.

See also: "Constant Functions" in perlsub

use re 'strict';
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] <https://github.com/Perl/perl5/issues/18755>

See "'strict' mode" in re

The <:win32> IO pseudolayer
Using this feature triggers warnings in the category "experimental::win32_perlio".

The ticket for this experiment is [perl #13198] <https://github.com/Perl/perl5/issues/13198>.

See also "PERLIO" in perlrun

Declaring a reference to a variable
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] <https://github.com/Perl/perl5/issues/15458>.

See also: "Declaring a Reference to a Variable" in perlref

There is an "installhtml" target in the Makefile.
The ticket for this experiment is [perl #12726] <https://github.com/Perl/perl5/issues/12726>.
(Limited) Variable-length look-behind
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] <https://github.com/Perl/perl5/issues/18756>.

See also: "(*positive_lookbehind:pattern)" in perlre and "(*negative_lookbehind:pattern)" in perlre

Unicode private use character hooks
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] <https://github.com/Perl/perl5/issues/18758>.

Unicode property wildcards
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] <https://github.com/Perl/perl5/issues/18759>.

isa infix operator
Introduced in Perl 5.32.0.

Using this feature triggers warnings in the category "experimental::isa".

The ticket for this experiment is [perl #18754] <https://github.com/Perl/perl5/issues/18754>

try/catch control structure
Introduced in Perl 5.34.0.

Using this feature triggers warnings in the category "experimental::try".

The ticket for this experiment is [perl #18760] <https://github.com/Perl/perl5/issues/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.
64-bit support
Introduced in Perl 5.005
die accepts a reference
Introduced in Perl 5.005
DB module
Introduced in Perl 5.6.0

See also perldebug, perldebtut

Weak references
Introduced in Perl 5.6.0
Internal file glob
Introduced in Perl 5.6.0
fork() emulation
Introduced in Perl 5.6.1

See also perlfork

-Dusemultiplicity -Duseithreads
Introduced in Perl 5.6.0

Accepted in Perl 5.8.0

Support for long doubles
Introduced in Perl 5.6.0

Accepted in Perl 5.8.1

The "\N" regex character class
The "\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

Linux abstract Unix domain sockets
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

Lvalue subroutines
Introduced in Perl 5.6.0

Accepted in Perl 5.20.0

See also perlsub

Backtracking control verbs
"(*ACCEPT)"

Introduced in Perl 5.10

Accepted in Perl 5.20.0

The <:pop> IO pseudolayer
See also "PERLIO" in perlrun

Accepted in Perl 5.20.0

"\s" in regexp matches vertical tab
Accepted in Perl 5.22.0
Postfix dereference syntax
Introduced in Perl 5.20.0

Accepted in Perl 5.24.0

Lexical subroutines
Introduced in Perl 5.18.0

Accepted in Perl 5.26.0

String- and number-specific bitwise operators
Introduced in Perl 5.22.0

Accepted in Perl 5.28.0

Alphabetic assertions
Introduced in Perl 5.28.0

Accepted in Perl 5.32.0

Script runs
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).
5.005-style threading
Introduced in Perl 5.005

Removed in Perl 5.10

perlcc
Introduced in Perl 5.005

Moved from Perl 5.9.0 to CPAN

The pseudo-hash data type
Introduced in Perl 5.6.0

Removed in Perl 5.9.0

GetOpt::Long Options can now take multiple values at once (experimental)
"Getopt::Long" upgraded to version 2.35

Removed in Perl 5.8.8

Assertions
The "-A" command line switch

Introduced in Perl 5.9.0

Removed in Perl 5.9.5

Test::Harness::Straps
Moved from Perl 5.10.1 to CPAN
"legacy"
The experimental "legacy" pragma was swallowed by the "feature" pragma.

Introduced in Perl 5.11.2

Removed in Perl 5.11.3

Lexical $_
Using this feature triggered warnings in the category "experimental::lexical_topic".

Introduced in Perl 5.10.0

Removed in Perl 5.24.0

Array and hash container functions accept references
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 "unique"
Introduced 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>"

Sebastien 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.
2022-02-19 perl v5.34.1

Search for    or go to Top of page |  Section  |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.