fixup issue  11479 and enum --> auto in examples
Merge pull request #1692 from blackwhale/bad-doc

[TRIVIAL] Fixup docs in std.regex
fix appenderNewCapacity for curLen == 0, start with minimum of 8.
Merge pull request #1695 from rainers/issue_11528

fix issue 11528: crashes or undefined behaviour of appender's first allocation
Fixup for issue 11532
Merge pull request #1698 from yebblies/issue11532

[trivial] Fixup for issue 11532