parts with no delimiter might get truncated during macro expansion

[countsudoku]

Macros will be expanded correctly only if the delimiter is in the expansion string, i.e.:
If we have a sender email in the form:

[email protected]

and the macro {%l1r-} the expansion is correct and the result is:

strong

But if the email address does not contain the delimiter

[email protected]

The expansion is truncated by on character:

trong