Why is the selector `{job=~'.*'}` illegal in PromQL?

ARegex matchers are not supported in selectors

BA selector must specify a metric name or at least one label matcher that does not match the empty string

CCurly-brace selectors require at least two matchers

DOnly exact-match operators can be used without a metric name

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Why is the selector {job=~'.*'} illegal in PromQL?

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Why is the selector `{job=~'.*'}` illegal in PromQL?