D-Programming-Language/phobos — pull request #2164 by DmitryOlshansky (2014-05-12 14:54:44+00:00)
Title: Fix issue 12691 std.regex.bmatch bug in empty OR operator inside of ()*

Must save variables that track advancement inside of infinite loops
on per thread basis. Apparently no amount of trickery would let us avoid it.