How to set max expiry for hashed-filenames?

Question

How should we setup the nginx-expires setting only for files that include a hash in the name?

e.g. the angular build process will output:

where:

ngs-worker.js (non-hashed filename) must not be cached
polyfills-es5.3eb4a9891f4a514281f1.js etc. (hashed file-name) can be cached forever

Now, I know I could setup max cache expiry for all js files and exclude some (e.g. ngs-worker.js)
But this would be disastrous when I forget a non-hashed file or if a future version will produce additional non-hashed files.

How should we handle this?
Maybe use a regex to find all hashed-files?

Construct a regular expression that only matches filenames with a hash, and use a map to set the expires value. See this answer. — Richard Smith
– Richard Smith, Commented May 14, 2020 at 8:58

TmTron · Accepted Answer · 2020-05-14 09:45:19Z

We use a regex to find all files that include a 20-char hash in the name (surrounded by dots)

# e.g. 'polyfills-es5.3eb4a9891f4a514281f1.js'. 'roboto-v18-latin-300.815babffe97b00a1f30b.woff2', .. location ~* "\.[a-f0-9]{20}\." { access_log off; expires max; }

note, that the location regex must be quoted - see this SO answer

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