Operators

Relational and containment operators

They are used to create simple conditions.

Operator		Description	Symbol
Relational	Equals	Is equal in value or amount to what is on the right of the sign.	=
	Does not equal	Is not equal in value or amount to what is on the right of the sign.	≠
	Is greater than	Is bigger in value or amount to what is on the right of the sign.	>
	Is greater than or equal to	Is bigger or equal in value or amount to what is on the right of the sign.	≥
	Is less than	Is smaller in value or amount to what is on the right of the sign.	<
	Is less than or equal to	Is smaller or equal in value or amount to what is on the right of the sign.	≤
Containment	Contains	Checks whether a sequence contains a given element. For example, the filter Subject, Contains, SPAM VIAGRA will return all messages of which headers contain SPAM and VIAGRA.	abc
	Does not contain	Checks whether a sequence does not contains a given element.	acb
	Is any of	Checks whether a sequence any of the given elements.	a, b, c
	Begins with	Checks whether a sequence begins with a given element.	[a]b
	Ends with	Checks whether a sequence ends with a given element.	b[c]

Logical operators

They are used to combine simple conditions into more complex expressions.

Operator	Description
And	Both conditions must be true for the complex expression to be true.
Or	If either condition is true, the complex expression is true.