Replacing on entiere set of files is hard in Emacs. But I find the correct mumbo-magic procedure, and gifted it to you:

On November 12, 2010 SearchBlox  announced the availability of SearchBlox Search Software as a completely FREE product.

We are happy to announce we have powered our searche engine, after importing Objectsroot.com blog articles.

This article has been retained for hisorical reasons. In this article we refers to blog.Objectsroot.com a site discontinued on August 2008