URL Regex Tester & Patterns

This tool gives you several URL format patterns, shows exactly which of your URLs it accepts, and writes it as code. Pick a limited web-address pattern (http or https with a domain-shaped host, localhost or an IPv4 address, plus optional port and path), a version where the scheme is optional, a short permissive pattern that also allows ftp, or an extractor that pulls links out of running text.

How to use this tool

1. Choose a pattern to match what your form or parser should accept.
2. Paste URLs one per line, or switch to "Find links" and paste any text.
3. Check the Valid and Invalid counts and the reason given for each rejected line.
4. Choose a language and copy the snippet.

Formula

^https?://(?:(?:label\.)+tld|localhost|IPv4)(?::\d{1,5})?(?:[/?#]\S*)?$

A label is 1–63 letters, digits or hyphens that does not start or end with a hyphen; the top-level domain is 2–63 letters or a punycode xn-- name. Each IPv4 octet is limited to 0–255. After the host come an optional :port and then anything without spaces that starts with /, ? or #. These patterns do not implement the full URL standard, IDNA validity, DNS lookups or an IPv6 host parser. Whitespace classes differ between regex engines; test non-ASCII input in the target language. Tables show at most 400 rows.

Example

With the default list and Web address, 4 of 7 lines pass: https://example.com, https://www.example.co.uk/path?q=1#top, http://localhost:3000/api and http://192.168.0.1:8080. example.com/page has no scheme, ftp://files.example.com uses a scheme that is not allowed, and https://exa mple.com contains a space. Make the scheme optional and the bare domain passes too (5 valid). The short permissive pattern also gives 5, but its extra pass is the ftp link.