RFR: 8065554: MatchResult should provide values of named-capturing groups [v2]

[Raffaello Giulietti]

> Add support for named groups to java.util.regex.MatchResult

Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:

  8065554: MatchResult should provide values of named-capturing groups

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10000/files
  - new: https://git.openjdk.org/jdk/pull/10000/files/fae689f3..d9945149

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10000&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10000&range=00-01

  Stats: 30 lines in 1 file changed: 15 ins; 0 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/10000.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10000/head:pull/10000

PR: https://git.openjdk.org/jdk/pull/10000