in reply to one line regular expression

What have you tried so far? It can be as simple as 
perl -nle '/metaattribute metaattribute-name="([^"]+)" metaobject-name
+="([^"]+)"/ and print "$2.$1"' textfile

[download]
if the attributes are always in order.

--shmem 

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

In Section Seekers of Perl Wisdom