Home > Regex > Regex URL Validation

Regex URL Validation Cheat Sheet

Validate URLs with regex patterns for protocol, domain, paths, and query strings in user-facing forms and APIs.

What this cheat sheet is for

This regex url validation reference helps you complete common developer tasks quickly and avoid repeated trial-and-error when working under deadlines.

  • When you need a reliable command or pattern during debugging and incident response.
  • When you are implementing a feature and want a known-good syntax example immediately.
  • When onboarding teammates and documenting repeatable workflows for daily use.
  • When reviewing pull requests and verifying that command usage follows best practices.

HTTP/HTTPS URL Pattern

Validates protocol, domain, optional port, and path.

^https?:\/\/(?:www\.)?[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}(?::\d{2,5})?(?:\/[\w.-]*)*(?:\?[\w=&%-]*)?(?:#[\w-]*)?$

Example

https://example.com
https://api.example.com/v1/users?active=true

Domain-only Pattern

^(?:[a-zA-Z0-9-]+\.)+[a-zA-Z]{2,}$

Example

devcheathub.com
sub.domain.co.uk

Practical Validation Workflow

Regex catches obvious mistakes, then URL parsing confirms RFC-compliant details.

new URL('https://devcheathub.com/docs')

Common mistakes / Pitfalls

  • People often copy a command or pattern without adapting placeholders, which can break production workflows unexpectedly.
  • It is easy to forget environment-specific differences, so always verify behavior in your shell, runtime, or API gateway before shipping.
  • Many errors come from skipping small validation steps, so test with realistic sample input before relying on the result.

Related Cheat Sheets

Last updated: February 2026