Regex

ELI5 — The Vibe Check

Regex is a secret language for describing patterns in text. Instead of saying 'find me all email addresses', you write a cryptic string of symbols that means the same thing to the computer. It looks like a cat walked on the keyboard but it's incredibly powerful.

Real Talk

Regular expressions are sequences of characters that define a search pattern. They are used for string matching, validation, search-and-replace, and parsing. Most languages have built-in regex support via a standard syntax derived from Perl.

Show Me The Code

const emailRegex = /^[\w.-]+@[\w.-]+\.\w{2,}$/;

console.log(emailRegex.test("user@example.com")); // true
console.log(emailRegex.test("not-an-email"));     // false

When You'll Hear This

"Write a regex to validate phone numbers." / "I used regex to strip HTML tags from the content."