I've recently released two new open source regex libraries.
Regex+
Regex+ provides a regex template tag for dynamically creating readable, high performance, native JavaScript regular expressions with best practices built-in and powerful/advanced features that improve performance, readability, and maintainability. It's lightweight and supports all ES2025 regex features.
Highlights include support for free-spacing and comments, atomic groups and possessive quantifiers (that can help you avoid ReDoS), subroutines and subroutine definition groups (that enable powerful subpattern composition), and context-aware interpolation of RegExp instances, escaped strings, and partial patterns.
Run npm install regex in your JavaScript project and then simply import {regex} from 'regex' to get started. Check out examples and more on GitHub.
Regex Colorizer 1.0
Regex Colorizer is a project that highlights regex syntax, for use in blogs, docs, and regex tools. I created it for old-school RegexPal back in 2007, but it hadn't received any updates since 2010. Until now. Version 1.0 is a significant update that improves its API and adds support for modern JavaScript regex syntax and flags. Check out the demo!