Worked on the xupefei/spark repository to enhance the clarity and maintainability of regex utility documentation within Python APIs. Focused on refining docstrings for functions such as regexp_count, regexp_extract, and regexp_extract_all, the effort aimed to clarify usage patterns and improve onboarding for new contributors. Expanded test coverage was introduced to ensure reliability and support future development. The approach emphasized documentation best practices and thorough testing, prioritizing code readability and reducing support overhead. By leveraging Python and data processing skills, the work contributed to higher code quality and more accessible regex functionality, facilitating easier adoption and collaboration within the project.