As much as I can tell I got ImageShack (Videos) working or a higher being took pity on me for wracking my brain.
Regular expression
Code:
http://img([\d]+)\.imageshack\.us/i/([\w\-\;&]+)\.mp4/
Replacement
Code:
<embed src="http://img$p1.imageshack.us/flvplayer.swf?f=$p2" width="$ameinfo[width]" height="$ameinfo[height]" allowFullScreen="true" wmode="transparent" type="application/x-shockwave-flash"/>
Extract destination data "yes"
Embedding Regexp
[code]http://img([\d]+)\.imageshack\.us/flvplayer\.swf\?f=([\w\-\;]+)[&\w;=+_-]*code]