($name, $path, $suffix) = fileparse('/home/foo/bar.txt', qr{[^.]*});


# or if you have a list of allowed suffices in @suf

@suf = qw/gif wav mpeg txt/;
($name, $path, $suffix) = fileparse('/home/foo/bar.txt', @suf);

# both lead to
# $name eq 'bar.'
# $path eq '/home/foo'
# $suffix eq 'txt'