regex - Regular Expressions: Get subdomain and domain -

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in nginx, have line states ~^(www\.)(?<sub>.+).(?<domain>.+)$.

how make can subdomain , domain separate? subdomain.example.com.

edit: tried ~^(www\.)?(?<sub>)\.?(?<domain>.+)$ , didn't work either.

you have escape .

~^(www\.)?(?<sub>.+?)\.(?<domain>.+)$

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