Strip anchors from JSON regexes

[hudson-ai]

What it says on the tin. Does regex = regex.lstrip("^").rstrip("$") for any user-passed regex under the json pattern keyword.

This strip is necessary in order to use json generation with the big FHIR schema because of the odd double anchors they use. It "should" be safe to do this, but I'd like some feedback if there is any dissent.

Note that this could potentially be pulled further down into the lexeme code, but I'm not 100% confident that this is "safe" from the perspective of maintaining users' intended semantics.

[hudson-ai]

Ping @mmoskal

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All modified and coverable lines are covered by tests ✅

Project coverage is 61.45%. Comparing base (b424a32) to head (ada4077).

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Flag	BASE (b424a32)	HEAD (ada4077)
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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1027      +/-   ##
==========================================
- Coverage   70.27%   61.45%   -8.83%     
==========================================
  Files          62       62              
  Lines        4468     4470       +2     
==========================================
- Hits         3140     2747     -393     
- Misses       1328     1723     +395     

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[mmoskal]

seems completely safe