The regular expressions created for looking for build started and build finished message in the comments is inserting the build job name directly as part of the regular expression. That works if the build job name is a simple name, but in our case we had some text in parentheses in the name of the build job. The regex parser took that as a capture group so the match failed because it would not match the parentheses in the name.
You should use a capture group for the job name and then compare the captured text to the build job name or else use java.util.regex.Pattern.quote to add any necessary escape characters. Here is a patch that fixes it: