As Charles states, there isn't and using those utilities, not a good idea.
With that being said, depending on how your site was created or setup it may be easier than you think. If your site follows the out of the box recommended way by using Page Types, then you might be able to do a replace in a SQL statement with very little impact because the fields in the Page Types rarely have any dependencies.
Now if your site uses a lot of editable text webparts then that could be a bit harder but it could be done.
Unfortunately, both those options won't get the site 100% complete simply because there are many other places where content can hide but those are the two most common.