std.regex needs help

[Dmitry Olshansky via Digitalmars-d]

I know it's not unusual to rant about open bugs and such but it's been 4 
months and I'm helpless.

I had some nice breakthrough in std.regex performance back in May but 
failed to deliver it to the mainline because of a bug:
https://github.com/dlang/phobos/pull/4286
If anyone fluent in backend can decipher issue:
https://issues.dlang.org/show_bug.cgi?id=15989
I'd indebt.

I'm not above a workaround if that's what it takes.

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Dmitry Olshansky