-The ^U key erases the current pattern, and you can cancel the
-selection by either interrupting the command with ^C or by typing ^G.
+The shortcuts ^A, ^E, ^U, and ^K do somehow what they do in readline,
+and you can exit selector without doing anything by either
+interrupting the command with ^C or by typing ^G.
+
+The ^R key switches between the standard multi-substring mode and the
+regexp mode, and ^I between the case-sensitive and case-insensitive
+modes.