I think I finally figured it out. I must have finally put the right symbol by trial and error into my regular expression. The following works in order for me to get a livescribe pencast correctly embedded:
Code:
http://[\w]*[\.]*mysite\.[\w/&;%-\.]+/([\d\w]+)\.live
The .live is just a dummy extension so I'm able to identify which links are livescribe video pencasts. Thanks for your offering to help earlier -- I think I have it all figured out now.
Tim