forgot to add src to the list of attributes I would like to accept.
Here is the updated list:

width:500,
height:400,
src:whatever.flv (or myimage.jpg, etc),
autoplay: false,
fit:false,
title:false,
closetitle:false,
firstitem:true

I think I have a good start on it. Here is what I have.
(\[mediaspace)(\s+(width|height|src|autoplay|fit|title|closetitle|
firstitem)=(\d|\w|\.)+)+\]

That has a few problems I would like to avoid if possible. It allows
multiple of the same attribute being set:
[mediaspace width=200 width=375]

And it also allows the attributes to be set with either numbers,
letters, or . (the period - I added due to src attribute needing file
extension)

If possible, I would like each attribute being able to be set only
once (or not at all - defaults will be used), and the following
settings:

width (numeric)
height (numeric)
src (normal file settings with extension)
autoplay (boolean)
fit (boolean)
title (boolean)
closetitle (boolean)
firstitem (boolean)

The following regex restricts what each can be set to, and allows to
put them in any order, but doesn't restrict one per.

(\[mediaspace)(\s+(width=(\d)+|height=(\d)+|src=(\d|\w|\.)+|
autoplay=(true|false)|fit=(true|false)|title=(true|false)|
closetitle=(true|false)|firstitem=(true|false))?)*\]

I thought the ? would restrict 0 or 1, but I guess not in this case.

I would appreciate any help you can offer.

Thanks

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