Reduces excessive allocation of Matcher.groups array when the original Pattern has no groups or less than 9 groups.
Original clamping to 10 possibly due to documented behavior from javadoc: "In this class, \1 through \9 are always interpreted as back references, " Only with Matcher changes RegExTest.backRefTest fails when backreferences to non-existing groups are present. Added a match failure condition in Pattern that fixes failing tests. As per existing `java.util.regex.Pattern.BackRef#match`: "// If the referenced group didn't match, neither can this" A group that does not exist in the original Pattern can never match so neither can a backref to that group. If the group existed in the original Pattern then it would have had space allocated in Matcher.groups for that group index. So a group index outside groups array length must never match. ------------- Commit messages: - 8311939: Excessive allocation of Matcher.groups array Changes: https://git.openjdk.org/jdk/pull/14894/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14894&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8311939 Stats: 9 lines in 2 files changed: 7 ins; 1 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/14894.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/14894/head:pull/14894 PR: https://git.openjdk.org/jdk/pull/14894
