non-empty strings using only characters belonging to
<a href="http://www.unicode.org/versions/Unicode6.0.0/">Unicode's</a>
L, M, N, P, and S general categories (the Graphic characters without
-spaces) and may also exclude the ASCII characters
-<code>!"#$%&'()*,:;<=>?[\]^`{|}</code>.
+spaces) and may also exclude the characters
+<code>!"#$%&'()*,:;<=>?[\]^`{|}</code>
+and the Unicode replacement character U+FFFD.
</p>
<p>