-foo: post must not match ‘foo’
foo | bar: post must match either ‘foo’ or ‘bar’
(foo | bar) baz: post must match either ‘foo’ or ‘bar’ plus the word ‘baz’
"foo bar": post must match the phrase ‘foo bar’
"foo bar"~5: post must match ‘foo’ and ‘bar’ within 5 words of each other
foo << bar: post must match ‘foo’ before ‘bar’
=foo: post must match exactly the word ‘foo’ (no ‘foos’, ‘fooed’, etc.)