nomatch > %esString%
nomatch is similar to match, but instead of the rule being used when a rule was matched, it will be used when a rule isn't matched in the group. A nomatch rule can include use, return, beep and normal characters.
Caveat: nomatch will not be fired in a "using keys" group if the current keystroke does not produce a character in normal use (e.g. modified keys, function keys). This is by design, and was originally intended to ensure that function keys, and modified keys such as Ctrl+X, were passed through to the underlying application.
esString: The extended string to output, including the statements mentioned above.
nomatch > beep
The nomatch statement was introduced in Keyman 3.0.