[xwiki-users] global text search and replace

Hi. I'd like to search through the body of all xwiki documents for a specified string (say, "fu"), and replace it with another ("bar"). Been searching extensions and google and haven't come-up with any way to do this. mediawiki does have an extension to enable this. Anything similar in xwiki? Thanks, --Xiao Su blah, blah, blah... the right of the people peaceably to assemble, and to petition the Government for a redress of grievances... blah, blah, blah