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| Expression | Attribute | Description | 
|---|---|---|
| Not Predicate | 
                   | 
                  Not predicate. If the predicate  | 
| And Predicate | 
                   | 
                  And predicate. If the predicate  | 
| Optional | 
                   | 
                  Optional. Parse  | 
| Kleene | 
                   | 
                  Kleene. Parse  | 
| Plus | 
                   | 
                  Plus. Parse  | 
| Alternative | 
                   | 
                  Alternative. Parse  | 
| Sequence | 
                   | 
                  Sequence. Parse  | 
| Expectation operator | 
                   | 
                  Expect. Parse  | 
| Difference | 
                   | 
                  Difference. Parse  | 
| List | 
                   | 
                  List. Parse  |