[Issue 16251] regex - `(..).*\1` doesn't match "axxxx"

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16251

--- Comment #6 from Dmitry Olshansky <dmitry.olsh at gmail.com> ---
(In reply to Vladimir Panteleev from comment #5)
> There are some backreference tests here:
> 
> https://github.com/dlang/phobos/blob/master/std/regex/internal/tests.d#L310-
> L315

Backreference should be fully supported. 

However instead it supported a subset of all possible backreferences, until now
I postponed the issue as not blocking most practical uses of backreferences.

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