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An event expression is a declarative way of expressing when the develper developer wishes the rule to be selected for evaluation.
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<eventex> ::= <ID 1> [:] <ID 2> [ <matches> [ setting( <id list> ) ] ] [where <BOOL EXPR>]
| ( <eventex> )
| <eventex> <eventop> <eventex>
| <eventop> ( <eventexes> )
| <eventex> [not] between ( <eventex> , <eventexes><eventex> )
| any <POS INT> ( <eventexes> )
| <groupop> <POS INT> ( <eventex> ) [ <aggregateop>(<ID>) ]
<matches> ::= <match> | <matches> <match>
<match> ::= <ID> <REGEXP>
<id list> ::= <ID> | <id list> , <ID>
<eventop> ::= or | and | before | then | after
<eventexes> ::= <eventex> | <eventexes> , <eventex>
<groupop> ::= count | repeat
<aggregateop> ::= max | min | sum | avg | push |
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