Evil Regex
Noun · Slang & Abbreviations
Definitions
A regular expression so complex or poorly designed that it is unreadable, fragile, or prone to catastrophic backtracking and performance issues. The term often mixes humor with real fear.
In plain English: A dangerously complicated regular expression that is hard to understand and can behave badly.
Example: "Do not touch that evil regex unless you have tests and a quiet afternoon."