<ul><li>The issue with Python regex not matching can be due to the unordered nature of sets in Python.</li><li>The unordered nature of sets causes the order of items to not be guaranteed when joined into a string for comparison, leading to test failures.</li><li>To resolve this issue, it is suggested to sort the set before joining to ensure a predictable order for comparison.</li><li>Sorting the set ensures that the order of elements will be consistent, allowing for accurate matching in tests.</li></ul>

Why Your Python Test Regex Isn’t Matching. The Hidden Gotcha with Sets

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