Can't get group to match - please help

This seemingly simple regex is causing me problems

my $test = "Pub LOC.REC.USEIB03375MAR09.mngref0 #010C9D94";
my ($res) = ($test =~ /Pub (\w+{\.\w+})\s#.*/);
if( $res ){
print "\n$res\n";
}


The problem is to extract the "LOC.REC.USEIB03375MAR09.mngref0" part of
the string, which may have three to six parts - so it could be
LOC.REC.USEIB03375MAR09 or it could be
LOC.REC.USEIB03375MAR09.mngref0.day9.test


What am I doing wrong ??

.

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