# Regex Tester

> A live regex playground that highlights every match in a test string and lists each match's numbered and named capture groups as you type a pattern and flags.

- Author: [astralyxdev](https://21st.dev/@astralyxdev)
- Library: astralyxdev
- License: MIT
- Tags: Developer Tool
- npm dependencies: lucide-react
- Live preview: https://21st.dev/@astralyxdev/components/regex-tester

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/astralyxdev/regex-tester?api_key=$API_KEY_21ST"
```

Requires a 21st API key (generate one at https://21st.dev/mcp) passed as `API_KEY_21ST`. Free accounts get a limited number of installs per day; unlimited on a paid plan — see https://21st.dev/pricing.

Full component directory: https://21st.dev/llms.txt · More like this: https://21st.dev/community/components/s/developer-tool.md