Regex Examples Cheat Sheet

Lowercase slug:
^[a-z0-9]+(?:-[a-z0-9]+)*$

Simple UUID v4 shape:
^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$

Basic URL starts with http/https:
^https?:\/\/[^\s]+$

Note: Prefer framework validators and parsers for production validation when available.