Hello, I had opened this bug because I had a bad regex in my code that was causing python to hang in the regex evaluation: https://bugs.python.org/issue46627. I have fixed the problem with that specific regex, but more generally I think it would be good to have a timeout option that could be configurable when compiling the regex so that if the regex didn't complete within the specified timeframe, it would abort and throw an exception. The bug was closed as Won't Fix and it was suggested that I bring up my idea here. The suggestion made to me on the bug was to read Mastering Regular Expressions and get better at writing regexes. I will take this advice, but this isn't really a reasonable solution to my problem for a few reasons. My use case is log parsing and I have a large number of regexes that run over many different log lines. With the volume of regexes I have, it's hard to make sure every regex has no potential problems, especially when the pathological behavior only occurs on certain inputs that may not have been anticipated when developing the regex. Also because of the volume of data these regexes are parsing, I would never want to allow a regex to run longer than a few milliseconds because if it did, that would kill my log processing throughput. I'd rather that it just raise an exception and move on to the next log entry. Thanks, J.B.