https://issues.dlang.org/show_bug.cgi?id=18114
--- Comment #8 from Jon Degenhardt <jrdemail2000-dl...@yahoo.com> --- I re-ran the benchmark with the new DMD 2.079.0 release (OS X). Numbers below are fastest of several runs, but were generally consistent: | Regex | 2.077.1 | 2.078.0-beta1 | 2.079.0 | |-----------------------+--------------+---------------+--------------| | 'abc' | 3819.314 ms | 6202.892 ms | 5077.937 ms | | '(aa)+(cc)+g' | 5457.678 ms | 8209.269 ms | 6672.057 ms | | '(aa|ax).+[gxb][cyw]' | 10121.181 ms | 12448.443 ms | 11254.978 ms | These results are a material improvement over 2.078.0-beta1, but still a fair bit off 2.077.1, by 10-25% depending on the test. Perhaps no longer a "performance regression", but there's still an opportunity for improvement. Would it be more appropriate to leave this open as an enhancement request? --