Python Regular Expressions with Examples - Linux Tutorials - Learn Linux Configuration
Regular Expressions in Python - Courses - codingforentrepreneurs.com
Online regex tester and debugger: JavaScript, Python, PHP, and PCRE : r/PHP
To all the programmers out there: RegExr.com is a site that lets you build and test regular expressions. Made me understand them when I was starting out. : r/InternetIsBeautiful