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Smart Regex Pattern Generator

Instantly generate production-ready regex for any data type or validation rule

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Common Patterns

Email Address

URL / Website

Phone Number

URL Slug

Networking & Systems

IPv4 Address

IPv6 Address

MAC Address

Domain Name

Data & Security

Credit Card

Strong Password

SSN (US)

Hex Color

Generated Pattern

Sample Valid Matches

Test this Pattern

Get a working pattern for common formats without writing one

Nobody enjoys writing an IPv4 or IPv6 expression from scratch. This generator is a library of twelve pre-written patterns for formats that come up constantly in forms, scripts and data cleaning. You pick a card, and the page shows the expression, a few example strings it is meant to match, and a link to open it in the Regex Tester. Despite the AI-style badge in the header, it works as a lookup of fixed patterns, not a tool that interprets a description you type.

Choosing and copying a pattern

Browse the cards, which are grouped under Common Patterns, Networking & Systems and Data & Security.
Click the card for your data type. The Generated Pattern panel appears with a dark display of the expression.
Check the Sample Valid Matches box beneath it to see what kind of input the pattern is written for.
Press Copy to take the pattern to your clipboard, or use Test this Pattern to open the Regex Tester with the pattern passed along.

The available patterns

Common: email address, URL, phone number and URL slug.
Networking: IPv4, IPv6, MAC address and domain name.
Data: credit card number, strong password, US social security number and hex colour.

The IPv4 pattern restricts each octet to 0 through 255, and the slug pattern permits lowercase letters and digits separated by single hyphens. The password pattern requires at least eight characters with a lowercase letter, an uppercase letter, a digit and one of a short list of special characters.

Using them sensibly

These patterns are anchored with a start and end marker, which suits validating a whole field but will not find a match buried inside a longer sentence. Remove the caret and dollar sign if you want to search within text. Treat them as strong starting points, not final authorities: the email pattern will reject some legal addresses and accept some odd ones, the phone pattern is deliberately loose, and the credit card pattern checks prefixes and lengths only, with no Luhn checksum. For real validation, confirm on the server and use an email verification message.

Copy the pattern into the environment you are targeting and test it there, since escaping rules differ between JavaScript, PHP and other languages. Nothing is generated from a prompt, so if your format is not among the twelve, build it with the cheat sheet and Regex Tester instead.

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Frequently Asked Questions

Can I describe my own format and get a regex?

No. Despite the badge in the header, the tool offers twelve fixed patterns such as email, URL, IPv4, IPv6, MAC address, domain, phone, slug, credit card, password, SSN and hex colour. For anything else, write the pattern using the cheat sheet and try it in the tester.

Why do the patterns start with a caret and end with a dollar sign?

Those anchors make the expression match the entire string, which is what you want when validating a form field. To find matches inside larger text, delete the caret at the start and the dollar sign at the end before using it.

Is the email regex a complete validator?

No. It covers typical addresses but cannot cover every valid form allowed by the email standards, and it cannot prove a mailbox exists. Use it for a quick format check and confirm ownership by sending a verification message.

Does the credit card pattern check the number is real?

It only checks card prefixes and digit counts for common networks. It does not perform the Luhn checksum test or contact any issuer, so a number can match the pattern and still be invalid. Never use it as proof of a valid card.

What does the Test this Pattern button do?

It opens the Regex Tester and passes the generated pattern in the address as a parameter. You can then paste sample text, adjust flags and view highlighted matches. If the pattern box is empty on arrival, simply paste it from the Copy button.