/usr/bin/rxrx is in libregexp-debugger-perl 0.001020-2.
This file is owned by root:root, with mode 0o755.
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 | #!/usr/bin/perl
eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
if 0; # not running under some shell
use Regexp::Debugger;
Regexp::Debugger::rxrx(@ARGV);
__END__
=head1 NAME
rxrx - command-line REPL and wrapper for Regexp::Debugger
=head1 DESCRIPTION
See the documentation of L<Regexp::Debugger>.
=cut
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