How to do find / replace in a book or collection in bloom

I would like to be able to do global replacements in a book or a collection of books. Is this possible in bloom? (Once I find out how an unbreakable space can be inserted I want to replace the space before all articles in all the books …)

If this is not possible inside bloom (yet), is there a backdoor where the files can be accessed (xhtml?) and changed by a knowledgeable user?

Any help is much appreciated.

Please see this topic regarding find and replace.