[Issue 20217] Regex literals don't escape double quotes

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20217

--- Comment #2 from MarkSill <marksillweb at gmail.com> ---
Ah, that makes much more sense. It wasn't clear to me that they were the same
when I was reading https://dlang.org/articles/regular-expression.html, though
reading it again, there are two examples of using regex without the r"" prefix.

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