| + | Include, the word must be present. |
| – | Exclude, the word must not be present. |
| > | Include, and increase ranking value. |
| < | Include, and decrease the ranking value. |
| () | Group words into subexpressions. |
| ~ | Negate a word’s ranking value. |
| * | Wildcard at the end of the word. |
| “” | Defines a phrase. |