[configuration] Fix regular expression and specify syntax used

open-telemetry / opentelemetry-specification

Specifications for OpenTelemetry

https://opentelemetry.io

Apache License 2.0

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Closed mx-psi closed 5 months ago

mx-psi commented 5 months ago

Escapes both start and end braces in regular expression for consistency; it seems like both escaping or not escaping would work per https://regex101.com/r/YH667H/1
Specifies regex syntax to avoid ambiguity

I am not sure whether this warrants a changelog