You may only enter words. Words may contain only letters and digits. The words you enter are searched for in the url, title, and body of each page.
Words may optionally be prefixed with a dash, to indicate that the word makes the entry match less. For example, if you wanted to search for plastic but not green, you would type in this:
plastic -green
You may prefix a word with a plus to require that word be in all returned documents; use both plus and minus to reject any documents containing word:
+plastic +-green
The archives are re-indexed at regular intervals, so this index may be missing up to few days of recent changes. Each search takes a few seconds.