Clarify regex1 text

Signed-off-by: David A. Wheeler <dwheeler@dwheeler.com>

docs/labs/regex1.html

@@ -111,8 +111,8 @@ <h2>Task Information</h2>
 that an input is must be either “<tt>ab</tt>” or “<tt>de</tt>”,
 use the regex “<tt>^(ab|de)$</tt>”.
 To validate the same thing in Python, use
-“<tt>^(ab|de)\Z</tt>” or “<tt>\A(ab|de)\Z</tt>” (note that it's
-not quite the same thing).
+“<tt>^(ab|de)\Z</tt>” or “<tt>\A(ab|de)\Z</tt>” (note that the
+regex pattern is slightly different).
 
 <p>
 More information is available in the OpenSSF guide