/usr/lib/x86_64-linux-gnu/perl5/5.22/version/regex.pm is in libversion-perl 1:0.9912-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | package version::regex;
use strict;
use vars qw($VERSION $CLASS $STRICT $LAX);
$VERSION = 0.9912;
#--------------------------------------------------------------------------#
# Version regexp components
#--------------------------------------------------------------------------#
# Fraction part of a decimal version number. This is a common part of
# both strict and lax decimal versions
my $FRACTION_PART = qr/\.[0-9]+/;
# First part of either decimal or dotted-decimal strict version number.
# Unsigned integer with no leading zeroes (except for zero itself) to
# avoid confusion with octal.
my $STRICT_INTEGER_PART = qr/0|[1-9][0-9]*/;
# First part of either decimal or dotted-decimal lax version number.
# Unsigned integer, but allowing leading zeros. Always interpreted
# as decimal. However, some forms of the resulting syntax give odd
# results if used as ordinary Perl expressions, due to how perl treats
# octals. E.g.
# version->new("010" ) == 10
# version->new( 010 ) == 8
# version->new( 010.2) == 82 # "8" . "2"
my $LAX_INTEGER_PART = qr/[0-9]+/;
# Second and subsequent part of a strict dotted-decimal version number.
# Leading zeroes are permitted, and the number is always decimal.
# Limited to three digits to avoid overflow when converting to decimal
# form and also avoid problematic style with excessive leading zeroes.
my $STRICT_DOTTED_DECIMAL_PART = qr/\.[0-9]{1,3}/;
# Second and subsequent part of a lax dotted-decimal version number.
# Leading zeroes are permitted, and the number is always decimal. No
# limit on the numerical value or number of digits, so there is the
# possibility of overflow when converting to decimal form.
my $LAX_DOTTED_DECIMAL_PART = qr/\.[0-9]+/;
# Alpha suffix part of lax version number syntax. Acts like a
# dotted-decimal part.
my $LAX_ALPHA_PART = qr/_[0-9]+/;
#--------------------------------------------------------------------------#
# Strict version regexp definitions
#--------------------------------------------------------------------------#
# Strict decimal version number.
my $STRICT_DECIMAL_VERSION =
qr/ $STRICT_INTEGER_PART $FRACTION_PART? /x;
# Strict dotted-decimal version number. Must have both leading "v" and
# at least three parts, to avoid confusion with decimal syntax.
my $STRICT_DOTTED_DECIMAL_VERSION =
qr/ v $STRICT_INTEGER_PART $STRICT_DOTTED_DECIMAL_PART{2,} /x;
# Complete strict version number syntax -- should generally be used
# anchored: qr/ \A $STRICT \z /x
$STRICT =
qr/ $STRICT_DECIMAL_VERSION | $STRICT_DOTTED_DECIMAL_VERSION /x;
#--------------------------------------------------------------------------#
# Lax version regexp definitions
#--------------------------------------------------------------------------#
# Lax decimal version number. Just like the strict one except for
# allowing an alpha suffix or allowing a leading or trailing
# decimal-point
my $LAX_DECIMAL_VERSION =
qr/ $LAX_INTEGER_PART (?: \. | $FRACTION_PART $LAX_ALPHA_PART? )?
|
$FRACTION_PART $LAX_ALPHA_PART?
/x;
# Lax dotted-decimal version number. Distinguished by having either
# leading "v" or at least three non-alpha parts. Alpha part is only
# permitted if there are at least two non-alpha parts. Strangely
# enough, without the leading "v", Perl takes .1.2 to mean v0.1.2,
# so when there is no "v", the leading part is optional
my $LAX_DOTTED_DECIMAL_VERSION =
qr/
v $LAX_INTEGER_PART (?: $LAX_DOTTED_DECIMAL_PART+ $LAX_ALPHA_PART? )?
|
$LAX_INTEGER_PART? $LAX_DOTTED_DECIMAL_PART{2,} $LAX_ALPHA_PART?
/x;
# Complete lax version number syntax -- should generally be used
# anchored: qr/ \A $LAX \z /x
#
# The string 'undef' is a special case to make for easier handling
# of return values from ExtUtils::MM->parse_version
$LAX =
qr/ undef | $LAX_DECIMAL_VERSION | $LAX_DOTTED_DECIMAL_VERSION /x;
#--------------------------------------------------------------------------#
# Preloaded methods go here.
sub is_strict { defined $_[0] && $_[0] =~ qr/ \A $STRICT \z /x }
sub is_lax { defined $_[0] && $_[0] =~ qr/ \A $LAX \z /x }
1;
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