Translations:Help:CirrusSearch/60/en


 * and
 * These run Regular expressions against the page source. They aren't efficient and we only allow a few of them to run at a time on the search cluster, but they are very powerful.  This [$link1 link] contains an explanation of the syntax and this [$link2 link] contains an actual grammar for the regex language. The version with the extra   runs the expression case insensitive and is even more inefficient.