Where do you test syntax of D regexp online?

[Suliman via Digitalmars-d-learn]

Adding "r" helped:

auto bigCodeBlock = regex(r"`{3}[\s\S]*?`{3}");

But now output is:
[["```\r\nvoid foo()\r\n{\r\n\twriteln(\"ppp\");\r\n}\r\n```"]]

But I do not \r\n\ symbols...