6 ['<code>use warnings</code>'],
7 ['<code>use utf8</code>'],
8 ['<code>\N{named character}</code>'],
10 ['<code>v1.2.3</code>'],
11 ['<code>sub :locked :method</code>'],
12 ['<code>open $fh, $mode, $expr</code>'],
14 release => '2000-03-23',
24 [q`<code>no utf8; $unicode</code>`, 'unicode overhaul: additional /\p{}/ properties'],
25 [q`<code>binmode $fh, ':perlio'</code>`, 'file handle behaviour altered by PerlIO layers'],
26 [q`<code>open $fh, '-|', @cmd</code>`, 'open list to fork a command without spawning a shell'],
27 [q`<code>open $fh, '>', \$var</code>`, 'perl scalars as virtual files'],
28 [q`<code>printf '%1$s', @args</code>`, 'syntax to use parameters out of order'],
29 [q`<code>1_2_3 == 123</code>`, 'underscores between digits allowed in numeric constants'],
30 # [q`<code>use if</code>`, 'conditional module inclusion'], # also installable in earlier versions
32 release => '2002-07-18',
42 ['<code>//</code>', 'defined-or operator'],
43 ['<code>~~</code>', 'smart-match operator to compare different data types <small>(updated in v5.10.1)</small>'],
44 ['<code>given</code>', 'switch statement to smart-match with <code>when</code>/<code>default</code>'],
45 ['<code>/(?<name>)/</code>', 'named capture buffers into <code>%+</code>'],
46 ['<code>s/keep\K//</code>', 'floating positive lookbehind, efficient alternative for <code>s/(keep)/$1/</code>'],
47 ['<code>/\v/, /\h/</code>', 'vertical and horizontal whitespace escapes'],
48 ['<code>my $_</code>', 'lexically scoped version of the default variable'],
50 release => '2007-12-18',
60 ['<code>package version</code>', '<code>package</code> NAME VERSION shorthand for <code>our $VERSION</code>'],
61 ['<code>...</code>', 'yada-yada operator: code placeholder'],
62 ['<code>use 5.012</code>', 'Implicit <code>strict</code> if use VERSION >= v5.12'],
63 ['<code>… when</code>', '<code>when</code> is now allowed to be used as a statement modifier'],
64 [q(<code>use overload 'qr'</code>), 'customisable conversion to regular expressions'],
65 ['<code>/\N/</code>', 'inverse \n to match any character except newline regardless of <code>/s</code>'],
67 release => '2010-04-12',
73 ['<code>s///r</code>', 'non-destructive substitution'],
74 ['<code>/(?^)/</code>', 'construct to reset to default modifiers'],
75 ['<code>/(?{ m// })/</code>', 'regular expressions can be nested in <code>/(?{})/</code> and <code>/(??{})/</code>'],
76 ["<code>use re '/flags'</code>", 'customize default modifiers'],
77 ['<code>each $ref</code> e.a.', 'array and hash container functions accept references'],
78 ['<code>FH->method</code>', 'filehandle method calls load IO::File on demand (eg. <code>STDOUT->flush</code>)'],
80 release => '2011-05-14',
89 ['<code>__SUB__</code>', 'current subroutine reference'],
90 ['<code>fc, "\F"</code>', 'unicode foldcase to compare case-insensitively'],
91 ['<code>"\N{}"</code>', 'automatic <code>use charnames qw( :full :short )</code>'],
93 release => '2012-05-20',
102 ['<code>${^LAST_FH}</code>', 'last read filehandle (used by <code>$.</code>)'],
103 ['<code>/(?[ a + b ])/</code>', 'regex set operations (character substraction <code>-</code>, unions <code>&</code>)'],
104 ['<code>my sub foo</code>', 'lexical subroutines (also state, our)'],
105 ['<code>next $expression</code>', 'loop controls allow runtime expressions'],
106 [q(<code>no warnings 'experimental::…'</code>), 'mechanism for experimental features, as of now required for smartmatch'],
108 release => '2013-05-18',
114 ['<code>sub ($var)</code>', 'subroutine signatures'],
115 ['<code>%hash{…}</code>', 'hash slices return key+value pairs'],
116 ['<code>[]->@*</code>', 'postfix dereferencing (also e.g. <code>$scalar->$*</code> for <code>$$scalar</code>)'],
117 [q(<code>use warnings 'once'; $a</code>), 'variables $a and $b are exempt from <em>used once</em> warnings'],
120 release => '2014-05-27',