RFR: 8264160: Regex \b is not consistent with \w without UNICODE_CHARACTER_CLASS [v6]

[Ian Graves]

> Proposed change in behavior to correct inconsistencies between `\w` and `\b` metacharacters

Ian Graves has updated the pull request incrementally with one additional commit since the last revision:

  Adding description of word-boundary regex

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7539/files
  - new: https://git.openjdk.java.net/jdk/pull/7539/files/57fef39c..77f9a5b6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7539&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7539&range=04-05

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7539.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7539/head:pull/7539

PR: https://git.openjdk.java.net/jdk/pull/7539