> For the complete documentation index, see [llms.txt](https://lukasz-nowakiewicz.gitbook.io/resources/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lukasz-nowakiewicz.gitbook.io/resources/javascript/extra-material.md).

# Extra Material

## Useful links

### Regex

{% embed url="<https://regex101.com>" %}
Regex
{% endembed %}

{% embed url="<https://www.youtube.com/playlist?list=PL4cUxeGkcC9g6m_6Sld9Q4jzqdqHd2HiD>" %}