gh-137477: Extend regex pattern check in inspect.findsource
#137479
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This reintroduces the regex removed in #117025 with an additional case for classes.
While this is still a more hacky solution than AST parsing, etc, it handles class definitions and edge cases where the source code line is incorrect (generator bytecode).
inspect.getsourcelines()
mishandles multi-line generator expressions #137477