Performance and reliability-focused month (2025-12) for microsoft/vscode, with a critical bug fix to PowerShell prompt detection in the integrated terminal. The changes mitigate a ReDoS vulnerability and improve input prompt detection reliability, contributing to a more robust PowerShell experience for users. Key achievements (Top 3-5): - Refactored the PowerShell prompt detection regex to prevent catastrophic backtracking (ReDoS) and ensure linear-time processing. - Fixed input prompt detection issues to remove false negatives/positives and improve terminal prompt accuracy. - Implemented targeted regex changes in the commit 87e50c657dd06bb5590a881a92eff80b174c5364 with clear messaging and risk reduction. Major bugs fixed: - ReDoS vulnerability in PowerShell prompt detection; replaced overlapping pattern with a safer pattern (?:[^\[\s]|\s+(?!\[))+ to enforce mutual exclusion and linear performance). Overall impact and accomplishments: - Improved reliability and security of the VSCode integrated terminal for PowerShell users, reducing CPU spikes and enhancing prompt accuracy. - Strengthened code quality around terminal prompt recognition, enabling safer future enhancements. Technologies/skills demonstrated: - Regex optimization and safe pattern design to prevent ReDoS - Performance-focused refactoring and regression risk management - Change, impact, and risk communication in commit messaging - Familiarity with VSCode terminal internals and PowerShell prompt handling