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

[via Digitalmars-d-bugs]

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

--- Comment #4 from Vladimir Panteleev <thecybershadow at gmail.com> ---
Strange. Well, it works for simpler cases, so it's either an unfinished
feature, or an undocumented and buggy one.

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