An overview of new features appeared in the version 5.14 of the Perl programming language.

1. What's new
in Perl 5.14

2. perldoc perlhist

3. 5.10.0
2007−Dec−18

4. 5.10 appeared
at its 20th birthday

5. ¿Are you using Perl >= 5.10?
— Ta k e p a rt in ou r su r ve y !

6. say
was introduced

7. ¿
Are you using
say
?

8. Seriously

9. The New History
Began with

10. Modern Perl

11. Modern Perl

12. Modern
Perl

13. Modern Perl term
is often understood
too widely

14. But it's just NOT these

17. That's from a book
published in 2009

18. OK, go further:
perldoc perlhist

19. we'll skip all odd (not even)
versions (5.11, 5.13) —
they are odd dev

20. 5.12.0
2010−Apr−12

21. ¿Are you using Perl >= 5.12?
— What i
s YAPC?

22. 5.14.0RC1
2011−Apr−20

23. RC — is a
release candidate

24. Then was
RC2

25. And then
RC3

26. Well, Perl 6's way
is much longer

27. Perl 5.14
is ready already

28. What's new
in Perl 5.14?

29. perldoc perldelta

30. perldelta =
= 5.14 – 5.12

31. Notice
As described in perlpolicy, the
release of Perl 5.14.0 marks the
official end of support for Perl
5.10. Users of Perl 5.10 or earlier
should consider upgrading to a
more recent release of Perl.

32. Frankly speaking,
it's not that easy to
update Perl's version
on existing machine

33. Modules are the
most difficult part

34. Do you know
how to reinstall
everything easily?

35. New

36. 1
Syntax

37. 2
Security

38. Remember...

39. register_globals = off
$_GET["sql"]
In PHP
since version 4.2.0

40. Perl is secure
by itself

41. 3
Incompatibilities

42. 4
Deprecations

43. 5
Performance

44. 6
Modules
and pragmas

45. 7
Documentation

46. 8
Diagnostics

47. 9
Utilities

48. 10
Install process

49. 11
Platforms

50. 12
Internals

51. 13
Bug fixes

52. 14
Опечатки

53. We'll only take a look
at syntax and
regular expressions
changes

55. (Well, it's time to
Welcome, Perl 6.0!)

56. Unicode affects both
strings and regexes

57. A bell
(fairy tale)

58. ASCII-character
BELL (0x7)

59. In Unicode 6.0
BELL — 0x1F514

60. Panic!

61. Perl is calm
and wise

62. Perl is calm
and wise
. . . probably

63. In Perl
BELL
=
0x0007

64. In Perl
BELL
=
0x0007
N{BELL}
=
0x0007

65. In Perl
BELL
=
0x0007
N{BELL}
=
0x0007
0x0007
=
ALERT

66. BELL
=
0x0007
N{BELL}
=
0x0007
0x0007
=
ALERT
ALERT
=
"a"

67. BELL
=
0x0007
N{BELL}
=
0x0007
0x0007
=
ALERT
ALERT
=
"a"
N{BEL}
=
0x0007

68. BELL
=
0x0007
N{BELL}
=
0x0007
0x0007
=
ALERT
ALERT
=
"a"
N{BEL}
=
0x0007
0x1F514
—
no name

69. 0x0007
=
ALERT
ALERT
=
"a"
N{BEL}
=
0x0007
0x1F514
—
no name
0x1F514
=
N{U+1F514}

70. 0x1F514
—
no name
0x1F514
=
N{U+1F514}
Plans for Perl 5.16
N{BELL}
=
0x1F514

71.
N{U+1F514}
Plans for Perl 5.16
N{BELL}
=
0x1F514
replace existing N{BELL}
with
N{ALERT},
N{BEL}
or
"a"

72. use
feature
'unicode_strings';

73. It brings the hope

74. That everything
is in Unicode

75. How to turn 5.14 on

76. use v5.14;

77. use strict;
adds itself
behind the scene

78. 5.10.0
v5.10.0
v5.10
vector string
version string
abbreviated — v-string

80. What's new in
regular expressions

81. (?^
.
.
.)

82. Switch off all the
modifiers locally

83. "ABC"
=~
/abc/i;
True

84. "ABC"
=~
/a(?^:b)c/i;
False

85. "ABC"
=~
/a(?^i:b)c/i;
True

86. Ingenious reason

87. $
perl5.14.0
-­‐MData::Dumper
-­‐E'my
$x
=
qr/abc/;
say
Dumper($x)'
$VAR1
=
qr/(?^u:abc)/;
No changes after adding new
modifiers to Perl

88. $
perl5.10.0
-­‐MData::Dumper
-­‐E'my
$x
=
qr/abc/;
say
Dumper($x)'
$VAR1
=
qr/(?-­‐xism:abc)/;
Will be changed after adding new
modifiers to Perl

89. New modifiers

90. /l
==
use
locale;

91. /u
==
use
feature
'unicode_strings';

92. /d
~~
no
locale;
no
feature
'unicode_strings';

93. by lt
de fau
/d
~~
no
locale;
no
feature
'unicode_strings';

94. /a

95. How many characters
match with
/d/

96. How many characters
match with
/d/
±420

97. for
(0x0
..
0x10FFFF)
{
my
$char
=
chr($_);
say
$char
if
$char
=~
/^d$/;
}

98. /d/ matches
any symbol
marked DIGIT
in Unicode

99. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,٠
٩ ,٨ ,٧ ,٦ ,٥ ,٤ ,٣ ,٢ ,١, ੦,
੧, ੨, ੩, ੪, ੫, ੬, ੭, ੮, ੯, ૦, ૧,
૨, ૩, ૪, ૫, ૬, ૭, ૮, ૯, ௦, ௧, ௨,
௩, ௪, ௫, ௬, ௭, ௮, ௯, ...

100. d became
a topic of arguments

101. /d's behaviour
is stable,
but contradictory
d

102. Welcome
/a

103. for
(0x0
..
0x10FFFF)
{
my
$char
=
chr($_);
say
$char
if
$char
=~
/^d$/a;
}

104. Only 10 ASCII
characters match
$
perl
a1.pl
|
wc
-­‐l
10

105. /a creates
ASCII versions
of the modifiers
d, s и w

106. And affects both
b and B

107. /r

108. Non-destructive
substitution

109. A substitution
that do not change
original string

110. use
v5.14;
my
$version
=
"Perl
5.10";
say
$version
=~
s/5.10/5.14/r;
Result: Perl
5.14

111. my $english = "colour";
my $american =
$english =~ s/our/or/r;

112. Arrays and hashes

113. Extra noise chars
to be removed

114. That feature
is experimental

115. use
v5.14;
my
$a
=
[];
push
$a,
3,
5,
7;

116. use
v5.10;
my
$a
=
[];
push
@$a,
3,
5,
7;

117. (Likewise @a[1]
in Perl 6)

118. And more

119. push/pop
@$arrayref
push/pop
$arrayref

120. shift/unshift
@$arrayref
shift/unshift
$arrayref

121. splice
@$arrayref
splice
$arrayref

122. keys/values
%$hashref
keys/values
$hashref

123. keys/values
@$arrayref
keys/values
$arrayref

124. each
%$href
/
@$aref
each
$href
/
$aref

125. given returns
the last
evaluated value

126. say
mysub(7);
sub
mysub
{
given($_[0])
{
"few"
when
3;
"OK"
when
5;
"many"
when
7;
"?";
}
}

127. (For those
who omit
return keyword)

128. git blame

129. Aaron Crane, Abhijit Menon-Sen, Abigail, Ævar Arnfjörð Bjarmason, Alastair Douglas, Alexander
Alekseev, Alexander Hartmaier, Alexandr Ciornii, Alex Davies, Alex Vandiver, Ali Polatel, Allen Smith,
Andreas König, Andrew Rodland, Andy Armstrong, Andy Dougherty, Aristotle Pagaltzis, Arkturuz,
Arvan, A. Sinan Unur, Ben Morrow, Bo Lindbergh, Boris Ratner, Brad Gilbert, Bram, brian d foy, Brian
Phillips, Casey West, Charles Bailey, Chas. Owens, Chip Salzenberg, Chris 'BinGOs' Williams,
chromatic, Craig A. Berry, Curtis Jewell, Dagfinn Ilmari Mannsåker, Dan Dascalescu, Dave Rolsky,
David Caldwell, David Cantrell, David Golden, David Leadbeater, David Mitchell, David Wheeler, Eric
Brine, Father Chrysostomos, Fingle Nark, Florian Ragwitz, Frank Wiegand, Franz Fasching, Gene
Sullivan, George Greer, Gerard Goossen, Gisle Aas, Goro Fuji, Grant McLean, gregor herrmann,
H.Merijn Brand, Hongwen Qiu, Hugo van der Sanden, Ian Goodacre, James E Keenan, James Mastros,
Jan Dubois, Jay Hannah, Jerry D. Hedden, Jesse Vincent, Jim Cromie, Jirka Hruška, John Peacock,
Joshua ben Jore, Joshua Pritikin, Karl Williamson, Kevin Ryde, kmx, Lars Dɪᴇᴄᴋᴏᴡ , Larwan
Berke, Leon Brocard, Leon Timmermans, Lubomir Rintel, Lukas Mai, Maik Hentsche, Marty Pauley,
Marvin Humphrey, Matt Johnson, Matt S Trout, Max Maischein, Michael Breen, Michael Fig, Michael G
Schwern, Michael Parker, Michael Stevens, Michael Witten, Mike Kelly, Moritz Lenz, Nicholas Clark,
Nick Cleaton, Nick Johnston, Nicolas Kaiser, Niko Tyni, Noirin Shirley, Nuno Carvalho, Paul Evans,
Paul Green, Paul Johnson, Paul Marquess, Peter J. Holzer, Peter John Acklam, Peter Martini, Philippe
Bruhat (BooK), Piotr Fusik, Rafael Garcia-Suarez, Rainer Tammer, Reini Urban, Renee Baecker, Ricardo
Signes, Richard Möhn, Richard Soderberg, Rob Hoelz, Robin Barker, Ruslan Zakirov, Salvador Fandiño,
Salvador Ortiz Garcia, Shlomi Fish, Sinan Unur, Sisyphus, Slaven Rezic, Steffen Müller, Steve Hay,
Steven Schubiger, Steve Peters, Sullivan Beck, Tatsuhiko Miyagawa, Tim Bunce, Todd Rinaldo, Tom
Christiansen, Tom Hukins, Tony Cook, Tye McQueen, Vadim Konovalov, Vernon Lyon, Vincent Pit, Walt
Mankowski, Wolfram Humann, Yves Orton, Zefram и Zsbán Ambrus.

130. use v5.14 or die;

131. Or at least

132. use v5.14 or v5.12 ;-)

133. __END__
Andrew Shitov andy@shitov.ru