It's not working because you're only replacing the first part, not the entire thing. Try this:
$var = ".declare book_num a13";
$var =~ s/^\.\w+\s+(\w+).*$/$1/g;
Or, forget the substitution:
$var = ".declare book_num a13";
$var =~ /^\.\w+\s+(\w+)/;
print $1;
(Make sure to check that there /was/ a match, of course). If you haven't already, check out the relevant perldocs as well, such as perlretut.
Update: Whoops,
ForgotPasswordAgain beat me to it.
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