AlmostAlphabet

The completeness of some character classes and terminal choices can be predicted, and compared to the actual value given by the grammar. For example, if a character class includes all Latin letters except one or all whitespace characters except \r, it may be an error.

Reference

Mats Stijlaart and Vadim Zaytsev. 2017. Towards a taxonomy of grammar smells. In Proceedings of the 10th ACM SIGPLAN International Conference on Software Language Engineering (SLE 2017). ACM, New York, NY, USA, 43-54.