Worked on the ruffle-rs/ruffle project to enhance AVM2 string processing stability, focusing on resolving a bug related to capture group 0 handling in string replacement operations. Addressed edge cases involving leading zeros in capture group numbers, ensuring the implementation matches the behavior of the debug Flash Player and prevents runtime panics. The solution involved careful use of regular expressions and string manipulation techniques, primarily utilizing ActionScript and Rust. This work improved runtime correctness and compatibility for Flash content playback, contributing to the reliability of Flash Player emulation without introducing new features during the period, but delivering targeted stability improvements.