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Regex Pattern Generator & Cheatsheet

Generate pre-built regular expression patterns for emails, URLs, IP addresses, and dates

Regular Expression (Regex) Studio

Real-time regex tester with capture group visualizer, standard regex pattern generator, and metacharacter escaper.

Click "Load in Tester" on any recipe to instantly test and inspect matches.

Email Address

Standard RFC 5322 compliant email address pattern.

^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$

HTTP / HTTPS URL

/gi

Matches valid web URLs with protocols, subdomains, paths, and query parameters.

https?:\/\/(www\.)?[-a-zA-Z0-9@:%._+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_+.~#?&//=]*)

US Phone Number

Matches standard 10-digit US phone formats with optional country code.

^(\+?1[-.\s]?)?$?([0-9]{3})$?[-.\s]?([0-9]{3})[-.\s]?([0-9]{4})$

IPv4 Address

Validates standard 4-octet dotted decimal IPv4 network address (0.0.0.0 to 255.255.255.255).

^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$

IPv6 Address

/gi

Matches full and abbreviated IPv6 hexadecimal addresses.

(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4})

ISO Date (YYYY-MM-DD)

Validates calendar dates in ISO 8601 YYYY-MM-DD format.

^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])$

Alphanumeric Only (A-Z, 0-9)

Ensures string contains only Latin letters and digits.

^[a-zA-Z0-9]+$

Strong Password Rule

Minimum 8 characters with at least 1 uppercase, 1 lowercase, 1 number, and 1 special symbol.

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$

UUID v4 Format

Validates standard 36-character hexadecimal UUID version 4 identifier.

^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$

CSS Hex Color Code

Matches valid 3-character or 6-character hexadecimal color codes.

^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$

About Regex Pattern Generator & Cheatsheet

Instant regex recipe generator for common developer tasks: emails, HTTP URLs, US phone numbers, IPv4, IPv6, ISO dates, passwords, and alphanumeric strings.

Key Capabilities & Features

One-click regex recipes for top 8 production use cases
Includes regex flags and human pattern descriptions
Send pattern directly to regex tester for live verification
Copy regex string in one click

How to Use Regex Pattern Generator & Cheatsheet

Choose Pattern

Select from email, URL, phone, IP, date, or password presets.

Inspect & Test

Click Test in Tester to test the recipe with sample input text.

Copy

Copy the verified regex pattern directly to your codebase.

Privacy & In-Browser Execution Guarantee

100% client-side generation.

Frequently Asked Questions

Are these regex patterns production-ready?

Yes. The recipes follow industry standards such as RFC 5322 for emails and standard ISO 8601 for dates.

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