Is there a good way to change UPPER CASE html tags to lower case, across a whole document?

So, I've got a bunch of markup-pages delivered that I am supposed to style. Problem is that tags are all in uppercase, even though the doctype declares it as 开发者_JAVA技巧xhtml. Not only is it ugly and hurting my eyes, it's also wrong, isn't it?

Is there a good way, perhaps a coda (my preferred tool), plug-in, or online service that can do this for me? Or can you do a regexp search-and-replace in coda, and if so, how? (I'll be the first to admit that regexp isn't my cup o'Java.)

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You could try figuring out how to do it in RegExp (something a little like /<([^>]*)>/g would be a bit too simplistic, but its a start) but that still presents problems. Coda's RegExp just does find-and-replace so I don't think you'd be able to do a "toLowerCase()" on each item found before replacing with Coda - you'd have to use some scripting language.

Another option is to download the W3C's Tidy application which I believe has "to uppercase" and "to lowercase" options, though I've not used it. It's here: http://tidy.sourceforge.net/#binaries (hasn't been updated in a while)