/usr/share/perl5/Test/Deep/RegexpVersion.pm is in libtest-deep-perl 1.127-1.
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 | use strict;
use warnings;
package Test::Deep::RegexpVersion;
# Older versions of Perl treated Regexp refs as opaque scalars blessed
# into the "Regexp" class. Several bits of code need this so we
# centralise the test for that kind of version.
our $OldStyle = ($] < 5.011);
1;
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