Worked on stabilizing the collection search functionality in the labring/FastGPT repository by addressing a critical bug affecting query reliability. Focused on backend development using TypeScript, the work involved implementing robust input sanitization and escaping special characters in user search queries to prevent regex errors and inaccurate results. Introduced a sanitization step with replaceRegChars to handle characters such as '.', '*', and '+', ensuring that search operations interpret user input correctly and securely. This approach improved the accuracy and reliability of search results, reduced erroneous matches, and enhanced overall security, demonstrating strong skills in API development, regex handling, and defensive coding.