End-of-input token emitted when the lexer reaches the end of the filter string.

An unquoted identifier token, such as an instance name or property key in a filter expression.

A string literal token delimited by single (') or double (") quotes, with backslash escape support.

A numeric literal token representing an integer or decimal value used in a comparison.

The case-insensitive keyword and, used to combine filter conditions with logical AND.

The case-insensitive keyword or, used to combine filter conditions with logical OR.

The equality comparison operator, matched as = or == in a filter expression.

The not-equal comparison operator (~=).

The greater-than comparison operator (>).

The greater-than-or-equal comparison operator (>=).

The less-than comparison operator (<).

The less-than-or-equal comparison operator (<=).

The colon character (:), used as a separator in filter expressions such as ClassName:PropertyName.

The dot character (.), used to navigate nested property paths in a filter expression.

The opening parenthesis character ((), used to begin a grouped subexpression in a filter.

The closing parenthesis character ()), used to end a grouped subexpression in a filter.

The single wildcard character (*), used to match any single name segment in a filter path.

The double wildcard token (**), which matches any number of path segments recursively across the instance hierarchy.

A character that is syntactically recognized but has no defined meaning in the current filter grammar.