Clarity on the map directive example

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This is a general query on the map (Caddyfile directive) — Caddy Documentation, specifically the example. There are a couple of entries in the first column of the table that read ~.*\.net$ and ~.*\.xyz$. The supporting explanation states: ‘…if the request is for any host that ends in .net or .xyz…’

I’m trying to figure out how these entries were created as I’d like to include an entry for a map table that uses the placeholder {path} as the source with the supporting explanation being ‘…if the request is for any path that starts with /xyz…’ Is this possible?

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If the condition starts with ~ then it’s a regexp. Is that what you missed? If not, I’m not sure I understand the question.

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I had no idea! Thanks for the heads up.

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It’s mentioned in the syntax doc:

<input> is the input value to match. If prefixed with ~, is treated as a regular expression.

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Also see this PR, capture groups will be usable in the next release (or build from the latest on master)

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Seriously, regex pattern matching is new to me. Can you please advise whether the regex expression ~^/xyz.* meets the stated requirement?

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https://regex101.com/ is your friend :slight_smile:

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Yep, it should. (And like @matt said, use regex101.com, it’s really good to try things out and explain in the sidebar what each character does).

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I believe I’ve used regular expressions in sed and grep, but I generally adapted canned responses I’d find online without any real understanding. I feel more confident now that I’ll be able to approach those tools with less trepidation. Thanks for enlightening me, gentlemen. :smile:

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