What version of 5.16 are you using, and what OS? It worked fine for me.
[~]$ perl -v
This is perl 5, version 16, subversion 3 (v5.16.3) built for x86_64-li
(with 1 registered patch, see perl -V for more detail)
Copyright 1987-2012, Larry Wall
Perl may be copied only under the terms of either the Artistic License
+ or the
GNU General Public License, which may be found in the Perl 5 source ki
Complete documentation for Perl, including FAQ lists, should be found
this system using "man perl" or "perldoc perl". If you have access to
Internet, point your browser at http://www.perl.org/, the Perl Home Pa
[~]$ perl -de1
Loading DB routines from perl5db.pl version 1.37
Editor support available.
Enter h or 'h h' for help, or 'man perldebug' for more help.
DB<1> $_ = '1223w3433.45+34'
DB<2> x /\d\D*/g
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