perf(pattern): improve general perf #1300
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Leverages the cache mechanism we added back in 5.4 so that each regular expression does not to be compiled each time.
Moreover, we avoid an allocation of an array if not required.
It's not like the perf gain is huge, but it's like 2-4% on average, which is still something.
Oh, and I expose cache to built-in (core) functions, because they didn't have access to it beforehand.
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Does this PR introduce a breaking change?