Regex

Regex is that one tool every programmer claims to know until they actually need to use it. Sure, you can copy-paste ^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$ from Stack Overflow for email validation, but the moment you need to write your own pattern from scratch? You're getting absolutely demolished.

The Spartan warrior represents programmers in their full glory—strong, confident, battle-tested. But regex? Regex is the tiny opponent that just casually kicks you into oblivion with a single lookahead assertion. You thought you were ready. You weren't. Nobody ever is.

Fun fact: Jamie Zawinski once said "Some people, when confronted with a problem, think 'I know, I'll use regular expressions.' Now they have two problems." Truer words have never been spoken.