A comprehensive guide to the dangers of Regular Expressions in JavaScript
Blog post from Sonar
The text discusses the issue of regular expression denial of service (ReDoS) vulnerabilities in JavaScript projects. It explains how ReDoS occurs when a regular expression engine takes too long to evaluate, causing a server or interface to hang or crash. The article provides examples of vulnerable regular expressions and their effects on user input validation and parsing. To fix ReDoS issues, it suggests limiting the expression's complexity, using atomic groups, taking multiple passes with simpler regular expressions, and avoiding regular expressions altogether if possible. It also mentions tools like regex101.com, Regexper, and eslint-plugin-regexp that can help detect and prevent ReDoS vulnerabilities in codebases.
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