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You’re pretty close but need to use an inner Handlebars expression for the key:

{{systemValue type='ENVIRONMENT' key=(regexExtract request.query.name '[A-Z_]+')}}

Ah cool, thanks, I wondered if I was missing something but couldn’t quite find it in the docs

Glad to hear it!

This is going to make replicating the AWS Secrets Lambda Layer locally so much easier

Good to hear you're getting value from it. AWS services can be a pain to test against.