Sometimes, we want to parse a string repeatedly.
In this case, we can use operator +.
For example:
S: A+;
terminals
A: 'a';
This grammar accepts a sequence of a and at least one a (optional white spaces are allowed).
Formally, S: A+; is shorthand for the following grammar rules:
S: A1;
@vec
A1: A1 A | A;
We will explain @vec later.
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