I've been debugging it and I wonder if it is a perl version problem, based on this error:

Regexp::Common::_decache(/usr/share/perl5/Regexp/Common.pm:138):
138:            my $cache = get_cache(@nonflags);
139:            _croak "Can't create unknown regex: \$RE{"
140:                . join("}{",@args) . "}"
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And this error

Use of uninitialized value $_ in print at (eval 42)[/usr/share/perl/5.
+30/perl5db.pl:738] line 2, <$rules_fh> line 1.
 at (eval 42)[/usr/share/perl/5.30/perl5db.pl:738] line 2, <$rules_fh>
+ line 1.
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