Filter Rules
Filter strings must adhere to these rules:
1. Field names may be fully qualified, such as:
struct_field.seq_field[2]
2. A character constant is a single character surrounded by single quotes, such as 'A'.
3. A string constant is zero or more characters surrounded by double quotes, such as "account".
4. If a character or string constant contains a single or double quote, precede the quote with a backslash. For example, '\"'.
5. Parentheses may be used to control the order of operator precedence, described in
Operator Precedence.