Code can't handle round brackets in strings

[AzzaAzza69]

Describe the bug
Unmatched brackets exception for a simple string concatenation.

To Reproduce
Steps to reproduce the behavior:
execute('"(" + "xyz"')

Expected behavior
execute function tests for unmatched brackets but does not ignore brackets within a "string" - bracket checking should occur per expression parsed.

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Additional context
Add any other context about the problem here.