Forgot to mention * as the right arg of flipflop.

$a ff * (or any of the other flipflop ops) means that there is no stop
condition. Once $a matches, the flipflop is always successful.

lib/Language/operators.pod

@@ -1163,6 +1163,13 @@ the first element is printed:
         say $_ if /A/ ff /B/;  # prints only "AB"
     }
 
+If you only want to test against a start condition, and have no stop condition,
+C<*> can be used as the "stop" condition.
+
+    for <A B C D E> {
+        say $_ if /C/ ff *; # prints C, D, and E
+    }
+
 For the sed-like version, which does I<not> try C<$_> on the stop condition
 after succeeding on the start condition, see L<C<fff>>.