Avoid unnecessary "not" groups in `parseCEL`

[jakeboone02]

• Fixes #698

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Codecov Report

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

Project coverage is 100.00%. Comparing base (ff58ee1) to head (6b94579).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #700 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 160 160 Lines 4918 4920 +2 Branches 2411 2436 +25 ========================================= + Hits 4918 4920 +2 ```

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