Regex
PHP Regex Advanced: http://www.phpclasses.org/package/9336-PHP-Match-MSDOS-UNIX-patterns-with-regular-expressions.html
Regular Expressions Cheat Sheet – Infographic: https://vm5.eu/blog/regular-expressions-cheat-sheet-infographic
CSS3 fonts
http://randsco.com/index.php/2009/07/04/p680 Expand Your Font Palette Using CSS3
Ikonok
Webikon: Over 600 Free Minimal Icons for UI Design
Favicon: Amit a favikonokról tudni érdemes