As far as I know, Dmitry Olhansky is actively working on Level 1 conformance as part of his GSoC project.
Comment #2 by dmitry.olsh — 2011-07-30T08:51:08Z
Indeed, and it's already here, though with a couple of quirks.
To the best of my knowledge my project addresses all of the present issues with std.regex. Which reminds me that it should go a little more public soon, stay tuned.
Comment #3 by bugzilla — 2011-07-30T11:42:12Z
That's great to hear! It's a little embarassing that we don't have this already.
Comment #4 by jlquinn — 2012-01-16T19:09:00Z
Does the new regex package now close this bug?
Comment #5 by dmitry.olsh — 2012-02-24T11:45:34Z
Closing this as full level 1 support is provided. Any problems and/or missing functionality should be regarded as bugs and filed as such.