Heritrix can hang on a pathological regex

Run a harvest with a single seed http://www.netarkivet.dk/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx and a single crawler-trap http://www\.netarkivet\.dk/((x+x+)+)y Look for the message in the logs that the regex search timedout - something like 2018-11-08 13:07:10.586 INFO thread-25 org.archive.modules.deciderules.MatchesListRegexDecideRule.evaluate() Timeout matching regex 'http: //www.netarkivet.dk/((x+x+)+)y' to url 'http://www.netarkivet.dk/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' in the heritrix error log.