Here are resources for a few fun regex examples:
- RFC822 in Perl: regexp-based address validation
- Divide By 7 - Example
- Hard Code Golf: Regex for divisibility by 7
- Demystifying The Regular Expression That Checks If A Number Is Prime
- Xavier Noria - repo on math by regex
Here are resources for additional regex tools:
- pythex
- Regular Expressions 101
- Matther Branett’s regex Library
- Parse: Parse strings using a specification based on the Python format() syntax
Here are resources for further reading about regex: