path: root/doc/vmod-dbrw.texi
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1 files changed, 13 insertions, 3 deletions
diff --git a/doc/vmod-dbrw.texi b/doc/vmod-dbrw.texi
index 40fc84d..31b15d1 100644
--- a/doc/vmod-dbrw.texi
+++ b/doc/vmod-dbrw.texi
@@ -496,19 +496,29 @@ ORDER BY weight
@end example
-Furthermore, the @code{url} column can contain a SQL wildcard pattern,
-in which case the query will look like:
+Furthermore, the @code{url} column can contain a path prefix,
+which can be matched using the @code{IN} conditional:
SELECT dest,pattern,value,flags
FROM rewrite
WHERE host='$host'
-AND '$url' like $url
+AND url IN ($(urlprefixes $url))
ORDER BY weight
@end group
@end example
+Notice the use of the @samp{$(urlprefixes $url)}. This invokes the built-in
+@dfn{function} @code{urlprefixes}, which expands to comma-separated
+list of properly quoted pathname prefixes, constructed from its
+argument. For example, if @samp{$url} is @samp{/local/user/local?a=1},
+then the expansion of @samp{$(urlprefixes $url)} is:
+@end example
@node Rewrite
@chapter The @code{rewrite} Function

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