Find and replace content in Tridion 2011?

We have a number of spots throughout our experience where there are hard-coded absolute references to images and we are looking to change that. An example would be a reference to an image src of . This is a no no, but it happened way back quite a bit and not just for images, for videos, files, css, etc as well. We are now moving to https sitewide so these all cause mixed-content issues, so we need to fix... but there are A LOT of them so by hand would take a while.

With that as background, does anyone have suggestions as to the best way to find and replace the content? For the most part we could really just change to OR just remove and leave the reference as /images/image1.jpg. In our case, both should work.

Thanks in advance for any ideas!