The <expression> part of a grammar rule can also contain grammar symbols.
Here is an example saying that the grammar symbol S is parsed by parsing the grammar symbol T:
S: T;
T: A;
terminals
A: 'a';
In a grammar rule, a grammar symbol can also be concatenated with another grammar symbol as well as a terminal. For example:
S: T T C T;
T: A B;
terminals
A: 'a';
B: 'b';
C: 'c';
This grammar accepts exactly the string ababcab with optional white spaces allowed in between.
➡️ Next: Empty String
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