[jdk17u-dev] RFR: 8271302: Regex Test Refresh

[Martin Doerr]

Clean backport of [JDK-8271302](https://bugs.openjdk.java.net/browse/JDK-8271302)

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Commit messages:
 - Backport fecefb8541d5056b1a8b105126ac9c566875e056

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/290/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=290&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271302
  Stats: 2253 lines in 3 files changed: 220 ins; 989 del; 1044 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/290.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/290/head:pull/290

PR: https://git.openjdk.java.net/jdk17u-dev/pull/290