what 262,715 regex questions on stack overflow haven't answered
Summary
The article analyzes 262,715 Stack Overflow regex questions to evaluate regex engine performance, focusing on complement and intersection techniques and benchmarking RE#, PCRE2, and other engines. It discusses the slowdowns caused by backtracking, the benefits of non-backtracking approaches, and security considerations (CWE-1333) and Unicode digit handling. It also promotes an open-source RE# engine and provides insights useful for developers optimizing regex use in real-world apps.