The replacement responder is invoked with a url of the form {{{SomePage?replace&searchString=search&replacementString=replacement}}}
The search string thereby follows the convention from the [[Java API description][http://java.sun.com/javase/6/docs/api/java/util/regex/Pattern.html]].

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 ^TestReplacesContent
 ^TestReplacementWithPatternGroups
 ^TestReplaceContentsInPageHierarchy