Document how to detect "import x.[some-regex]"

[ievans]

We've seen many users and bugs related to the general pattern of "I'd like to detect imports under some namespace, probably with a regex." cc @clintgibler @minusworld @DrewDennison

Examples:

• import not matching what's expected #1771
• Python: Matching multiple imports in Go #1897
• Can't find the ticket, but for Javascript: https://semgrep.dev/s/rx46

Desired outcome:

• First be able to do this without metavariable-regex (Import inconsistencies between languages #975)
• Then add a section to our "rule examples" in the readme and in /docs that shows how to detect imports combining semgrep + regex for all general-availability languages

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[ievans]

Keep

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[ievans]

Go away stalebot

[ievans]

This is partially addressed by https://github.com/returntocorp/semgrep-app/pull/2944 :D 🧙

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