RFR: 8271302: Regex Test Refresh

[Ian Graves]

8271302: Regex Test Refresh

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Commit messages:
 - Migrating regular expression tests to TestNG

Changes: https://git.openjdk.java.net/jdk/pull/5092/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5092&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271302
  Stats: 2226 lines in 3 files changed: 225 ins; 965 del; 1036 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5092.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5092/head:pull/5092

PR: https://git.openjdk.java.net/jdk/pull/5092