This bug was caused by dependencies on older regular expression classes. In fact, we were also compiling and using regular expressions incorrectly in JQuery. These problems have been fixed for the next release.
You will see this error if you have a file with no extension in your eclipse project. It will be fixed for the next release but in the meantime, renaming your file and adding some kind of extension will fix the problem.
Certain packages should be exported from the ca.ubc.jquery.browser plugin so that other users can re-use them.
The following packages should probably be exported:
ca.ubc.jquery.gui.*
ca.ubc.jquery.browser.*
ca.ubc.jquery.query
Most of these classes are re-usable to some extent and so should be exported.