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#! /usr/bin/env perl
# common regex delimiters
sub substitutionOperator
{
s!\\!\\\\!g;
s!\\!\\\\!g;
s!"!\\"!g;
s!\(!\\\(!g;
s!\)!\\\)!g;
}
$a =~ s/foo/bar/;
$b =~ s!foo!bar!;
$c =~ s@foo@bar@;
$d =~ s\foo\bar\;
# balanced regex delimiters
$e =~ s{foo}{bar};
$f =~ s(foo)(bar);
$g =~ s<foo><bar>;
$h =~ s[foo][bar];
# balanced regex delimiters with whitespace
$i =~ s{foo} {bar};
$j =~ s<foo> <bar>;
$k =~
s(foo)
(bar);
$l =~ s{foo} <bar>;
$m =~ s(foo) !bar!;
$n =~ s[foo] $bar$;
# /x modifier after regex delimiters
$o =~ s{
foo
} {bar}x;
$p =~ s%
foo
%bar%x;
#
# arbitrary regex delimiters
my $re_1 = m,This should match,;
my $re_2 = m aSo should thisa;
if $filename and $filename =~ m,usr/share/doc/[^/]+/examples/,;
# keys in hashes aren't match as regular expressions
my %countries = ( england => 'English',
france => 'French',
spain => 'Spanish',
china => 'Chinese',
germany => 'German',
mozambique => 'Mozambican');
# transliterations
say "food" =~ tr/o/e/r;
$r =~ tr ^y^z^;
$s =~ y/[]|/()&/; # "backward" compatible
# quoted strings
my $a = 'foo';
my $a = 'foo\'s bar';
my $a = 'foo\bar';
my $a = 'foo\\bar';
my $a = "foo";
my $a = "foo \" bar";
my $a = "foo\bar";
my $a = "foo \057 \x7f \x{263a} \cC \N{GREEK SMALL LETTER SIGMA} bar";
my $a = "invalid escape \w";
print "a: ";
print $a, " - ";
print $a, "\n";
my $str1 = "This is a ${ string } with fancy interpolation."
my $cmd1 = `So is @{ this } one.`
my $str2 = "This is a $string with plain interpolation."
my $cmd2 = `So is @this one.`
my $str3 = 'A boring $string.'
my @w = ( q!str4!, qw< str5 str6 >, qq(str7 $str1), qx`false`, qr/foo/ );
$a = qr/bar/i;
my %x = ( q_ThisString => "doesnt_overrun as if it were q-quoted" );
# from http://gist.github.com/485595
use strict;
use warnings;
use Time::HiRes 'usleep';
for (1..5) {
open my $in, '<', '/proc/sys/kernel/random/entropy_avail' or die;
print <$in>;
close $in;
usleep 100_000;
}
# other miscellaneous tests of numbers separated by _
usleep 100_000;
100_000_000;
my $nichts = 0.005_006;
print 900_800_700.005_006_007, $/;
# numbers from `man 1 perlnumber`
my $n;
$n = 1234; # decimal integer
$n = 0b1110011; # binary integer
$n = 01234; # octal integer
$n = 0x1234; # hexadecimal integer
$n = 12.34e-56; # exponential notation
$n = "-12.34e56"; # number specified as a string
$n = "1234"; # number specified as a string
# other numbers
for (
-9876,
+8765,
-9876.02,
-9876.02e+10,
+765_432e30,
2002.,
.2002,
) {
print $_, "\n";
}
# operators on numbers
for (
$n + 300,
$n - 300,
$n / 300 + 10,
$n * 250 / 2.0,
$n == 100,
$n != 100,
$n > 100,
$n >= 100,
$n < 100,
$n <= 100,
$n % 2,
abs $n,
) {
print $_, "\n";
}
=head1 Single Quote Breaker
That's all folks
=cut
sub foo {
"after the POD with the single quote, it's all still good"
}
# operators
my $moduloOperation = $totalNumber % $columns ? 1 : 0;
$moduloOperation = 2;
my $addOperation = $totalNumber + $myOtherVar;
sub __END__but_not_really { 1 }
# fat commas
use constant EMPTY_SPACE => ' ';
my %h = ( FOO => 23 );
$text = format_text({FOO => 23, BAR => 30});
foo(
sub # comment
# second comment
=> 1
)
# sigils
${ $sref }
@{ $aref }
$#{ $aref }
%{ $href }
&{ $cref }
*{ $gref }
@$aref[ ... ]
@$href{ ... }
%$aref[ ... ]
%$href{ ... }
$sref->$*; # same as ${ $sref }
$aref->@*; # same as @{ $aref }
$aref->$#*; # same as $#{ $aref }
$href->%*; # same as %{ $href }
$cref->&*; # same as &{ $cref }
$gref->**; # same as *{ $gref }
$aref->@[ ... ]; # same as @$aref[ ... ]
$href->@{ ... }; # same as @$href{ ... }
$aref->%[ ... ]; # same as %$aref[ ... ]
$href->%{ ... }; # same as %$href{ ... }
__DATA__
This is just some end text; everything after DATA can be accessed
by the <DATA> filehandle. __END__ does the same thing, without the
filehandle, but we can't test both in the same file.
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