<tr><td>+</td><td>The word is mandatory in all text returned.</td></tr>
<tr><td>-</td><td>The word cannot appear in any text returned.</td></tr>
<tr><td><</td><td>The word that follows has a lower relevance than other words, although text containing it will still match</td></tr>
<tr><td>></td><td>The word that follows has a higher relevance than other words.</td></tr>
<tr><td>()</td><td>Used to group words into subexpressions.</td></tr>
<tr><td>~</td><td>The word following contributes negatively to the relevance of the text (which is different to the '-' operator, which specifically excludes the word, or the '<' operator, which still causes the word to contribute positively to the relevance of the text.</td></tr>
<tr><td>*</td><td>The wildcard, indicating zero or more characters. It can only appear at the end of a word.</td></tr>
<tr><td>"</td><td>Anything enclosed in the double quotes is taken as a whole (so you can match phrases, for example).</td></tr>