Operator Precedence
Precedence is the concept that Bing evaluates the action of some operators before evaluating the action of other operators.
Precedence Logic
AND, &&, and & have higher precedence than OR, |, and ||.
Examples
foo bar OR bing yahoo
is the same as
(foo AND bar) | (bing AND yahoo)
instead of
foo (bar | bing) yahoo
Similarly,
foo AND bar NOT hello
is equivalent to
(foo AND bar) NOT hello
foo OR bar NOT hello
is equivalent to
(foo OR bar) NOT hello