[code-reflection] Integrated: Hat switch from pattern to regex

[Gary Frost]

Replaced Pattern with Regex. 

Cleaned up some op pattern matches using Optlk helpers

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Commit messages:
 - Some housekeeping
 - Replace Pattern with Regex and cleanup some Op matches

Changes: https://git.openjdk.org/babylon/pull/787/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=787&range=00
  Stats: 295 lines in 20 files changed: 200 ins; 36 del; 59 mod
  Patch: https://git.openjdk.org/babylon/pull/787.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/787/head:pull/787

PR: https://git.openjdk.org/babylon/pull/787