RFR: 8309515: Stale cached data from Matcher.namedGroups() after Matcher.usePattern()

[Raffaello Giulietti]

On Wed, 7 Jun 2023 11:20:02 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

> The cached `namedGroup` field must be invalidated during an invocation of `Matcher.usePattern()`

Also added a test for this change.

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PR Comment: https://git.openjdk.org/jdk/pull/14350#issuecomment-1580578032