fix: update regex engine to support possessive match and lookbehind syntaxes

[cmmoran]

Update the regexp to conditionally (naively?) change the current start,end delimiters for the regexp from the hard-coded '<','>' to '{','}' when the compiler encounters a pattern that has syntax that includes '(?<' or '(?>' organically.

BREAKING CHANGES: None

Related issue(s)

Relates:

441

Fixes:

1089

Checklist

• [x] I have read the contributing guidelines.
• [x] I have referenced an issue containing the design document if my change introduces a new feature.
• [x] I am following the contributing code guidelines.
• [x] I have read the security policy.
• [x] I confirm that this pull request does not address a security vulnerability. If this pull request addresses a security vulnerability, I confirm that I got the approval (please contact security@ory.sh) from the maintainers to push the changes.
• [x] I have added tests that prove my fix is effective or that my feature works.
• [ ] I have added or changed the documentation.

Further Comments

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.88%. Comparing base (8fc9b7a) to head (ae8fb6e). Report is 7 commits behind head on master.

:exclamation: Current head ae8fb6e differs from pull request most recent head e3e9566

Please upload reports for the commit e3e9566 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1147 +/- ## ========================================== - Coverage 77.90% 77.88% -0.03% ========================================== Files 80 80 Lines 3929 4047 +118 ========================================== + Hits 3061 3152 +91 - Misses 595 616 +21 - Partials 273 279 +6 ```

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