Define a local text replacement for all indexed urls. The replacement is performed before the url is retrieved remotely. If a replacement occurred, a local file with the resulting url will be tentatively retrieved. In case of failure, including non-existent files and read errors, the remote url will be retrieved normally.
Using this option, you might dramatically speed-up the indexing process. Moreover, this directive supports virtual if-Modified-Since. A file that has a modification time-stamp in the past from the one in the current database, the contents will be reported as 304 Not Modified. When used in conjunction with the Index.html directive, documents such as http://www.foo.com/ can be retrieved locally as well.
With the RegExp option enabled, the source and target parameters must be regular expressions. For regular expressions syntaxes, see the RegExp section. This option has the RegExp ReplaceLocal extension since version 1.6.
This option was added in version 1.32.