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Regex Pack: Form Validation

A 1-page snippet pack for validating form input: 10 short entries with copy-ready code.

ForDevelopers

regex-pack-form-validation.pdfShowing 10 of 39 lines
// Simple email shape
const pattern = /^[^\s@]+@[^\s@]+\.[^\s@]{2,}$/;
pattern.test("ada@example.com"); // true

// Username
const pattern = /^[A-Za-z][A-Za-z0-9._-]{2,15}$/;
pattern.test("ada_l"); // true

// Strong password rule
const pattern = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{8,}$/;

What's inside

Format
PDF, Markdown, JS
Contents
10 patterns
Version
1.0 · Updated 3 Oct 2026
Licence
Commercial What this means
Checked
Checked before it ships
  • regex-pack-form-validation.pdfPDF · 20 KB
  • regex-pack-form-validation.mdMarkdown · 2 KB
  • regex-pack-form-validation.jsJS · 1 KB
  • LICENSE.txtadded to every download

About this item

A compact, printable snippet pack for validating form input. Each of the 10 entries has a one-line explanation and a small example you can paste into your editor. The PDF uses a two-column A4 layout designed to sit next to your keyboard, and the same content ships as Markdown so you can search it or drop it into your notes, plus a JavaScript module that exports every pattern. Every JavaScript example targets ES2023.

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