Regex #
- Regular expression syntax cheat sheet - mdn web docs
- regexp cheatsheet - devhints.io
CSS #
- CSS, CSS tricks and CSS system fonts - devhints.io
- A free visual guide to CSS - cssreference.io
- CSS Tutorial - w3schools.com
- Alpha codes for hexadecimal color values - apply transparency to hex color codes
- SCSS Cheatsheet - useful functions & mixins