Update regex for FnSub

[kddejong]

Issue #, if available:

Description of changes:

• Update regex for FnSub

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.84%. Comparing base (310beb4) to head (6ebbbd6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3878      +/-   ##
==========================================
+ Coverage   93.83%   93.84%   +0.01%     
==========================================
  Files         365      365              
  Lines       12516    12516              
  Branches     2572     2572              
==========================================
+ Hits        11744    11746       +2     
+ Misses        426      424       -2     
  Partials      346      346              

Flag	Coverage Δ
unittests	93.80% <100.00%> (+0.01%)	⬆️

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