After some probing, I think the problem is with the name of the filter and not the regular expression. Putting a space in the name caused the application to crash. The solution is replace the space with a hyphen. This was not a problem with version 3.4.1 which I used previously.
After some probing, I think the problem is with the name of the filter and not the regular expression. Putting a space in the name caused the application to crash. The solution is replace the space with a hyphen. This was not a problem with version 3.4.1 which I used previously.