Custom command to strip all except specified tags / parameters using javascript or regex?

Hi all
I'm trying to figure out how to create a custom command that will allow me to strip all tags from a page except for those I specify, and will only allow the parameters that I specify for the remaining tags. It seems to me that it should be achievable either with a custom command using javascript, or by simply recording a command and doing a search and replace with regex.
I'm not familiar with javascript, so I've been trying the latter route, but I'm open to help with either method (or for that matter, any other method that will allow me to perform this with just a couple of mouse clicks, and no need to initiate a long sequence of commands manually every time).
The tags I'd like to retain are:
p
br
ul
ol
li
a
table
tr
td
Any tags other than the above would need to be stripped. For the tags above, I'd obviously want to retain opening and closing tags, and I'd also want to allow href and target parameters for the a tag. I would want to strip all other parameters from these tags, though.
I got partway into this, in that I managed to make regex that finds all the tags apart from the above, but hadn't yet gotten to trying to strip the unwanted parameters:
</?\w+(?<!p|br|ul|ol|li|a|table|tr|td)((\s+\w+(\s*=\s*(?:".*?"|'.*?'|[^'">\s]+))?)+\s*|\s* )/?>
This validates on the online version of RegExr (http://gskinner.com/RegExr/), and finds all tags apart from the above correctly as far as I can see. However, it doesn't work in Dreamweaver's Find box with Use Regular Expression checked, reporting "Invalid Quantifier".
...and this is as far as I've gotten. If anybody can offer help, it'd be much appreciated!
Thanks in advance to you all...
Mike

Thanks, Barry. Paste Special is what I'm currently doing, but as you can imagine, it's mighty tedious cleaning up the formatting by hand on every single document, when the formatting I need is all there to start with in a regular paste -- just along with a bunch of extraneous formatting. With as many as a dozen or more documents to do each day, some with lengthy, nested lists and many bits of formatting that I need to keep, it's a bit soul destroying to have to do it manually.
It must be possible with Javascript, but my problem is I'm not a Javascript coder and would need to learn from scratch. It's likely possible with regex too, but my issue there is that Dreamweaver's version of Regex seems to be cut down from the version all of the regex validators I could find online use. I came fairly close to having something workable done entirely with regex when I last looked at this a couple of months back, and it validated just fine (only remaining quirk was to do with some attributes I didn't need, but that was probably solvable.) Unfortunately, although it validated in multiple online tools, Dreamweaver refused to accept it as valid.
I've since found a (very old) Dreamweaver Command extension that partially works, incidentally, and could perhaps be extended to do what I need -- but again, it would require me to understand code I simply don't, as yet.
http://www.andrewwooldridge.com/dreamweaver/commands.html
The Remove Tags Except command there mostly works, but it seems to have an issue with nested tags that throws up an error message, and it also doesn't have a way for me to specify which attributes to keep, just which tags. Other than that it's close to ideal though -- the only other way it could be improved would be if I could kludge it to simply run straight away with a predetermined exclusions file, rather than making me manually select and load the exclusions every time.

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