Worked on the microsoft/presidio repository to enhance the clarity and accuracy of regex-related documentation. Focused on updating the 02_regex.md file, the work involved replacing deprecated escape sequences with raw string literals in Markdown documentation. This change addressed a specific deprecation warning and brought the documentation in line with current best practices for defining regular expressions. By leveraging skills in documentation and Markdown, the update aimed to reduce confusion for developers and streamline onboarding. The contribution did not involve bug fixes or feature development beyond documentation, but it improved maintainability and ensured that future users encounter fewer issues with regex usage.