AI Regex Generator

LOCAL · Browser-Only

Browse 35+ common regex patterns or generate custom ones with AI

Regex Pattern Library

Browse 35+ ready-to-use patterns. Click any pattern to load it into the tester below.

AI-PoweredOptional

Generate with AI

Describe what you want to match in plain English. Requires your own API key -- stored only in your browser, never sent to our servers.

AI Provider

API Key(stored locally only)

Your API key stays in this browser. We never see it and never send it to our servers. It is used only to call OpenAI directly.

Describe what you want to match

Enter your API key above to enable AI generation. The key is stored only in your browser.

Test Your Pattern

Pattern

//g

Test String

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What is AI Regex Generator?

Free online AI regex generator to find the perfect regex pattern from a curated library of 35+ common patterns for emails, URLs, phone numbers, dates, credit cards, UUIDs, and more.

Each pattern includes a description, flags, and example text so you can test it instantly. Optionally, bring your own OpenAI or Anthropic API key to generate custom regex patterns by describing what you want to match in plain English. The AI key is stored only in your browser localStorage and is never sent to our servers. The built-in pattern library works without any API key, making this tool fully useful out of the box. No signup required.

How to Use AI Regex Generator

1Browse the pattern library by category or search for a specific pattern
2Click any pattern to load it into the tester with example text
3Paste your own text in the test area to see matches highlighted
4Optionally, enter your API key and describe a custom pattern in plain English to generate one with AI

Frequently Asked Questions

Do I need an API key to use this tool?

No. The tool includes 35+ pre-built regex patterns for common use cases like emails, URLs, phone numbers, dates, and more. These work without any API key. The AI generation feature is an optional bonus for custom patterns.

Is my API key safe?

Yes. Your API key is stored only in your browser's localStorage and is never sent to our servers. When you generate a pattern, the request goes directly from your browser to the AI provider. We never see or store your key.

How do I generate a regex from a plain English description?

Add your API key, then type what you want to match in everyday words, for example 'a US phone number with optional country code' or 'words that start with a capital letter'. The AI returns a regular expression you can test immediately in the built-in tester.

Can I test the generated regex patterns?

Yes. The tool includes a built-in tester where you can paste any text and see matches highlighted in real time. It shows match count, indices, and highlighted text for easy debugging.

Which common patterns are included without AI?

The library covers emails, URLs, phone numbers, dates, times, IP addresses, hex colors, UUIDs, credit card numbers, postal codes, usernames, passwords, and more. Each comes with flags and example text so you can confirm it matches what you expect before using it.

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Keep reading: Git Cheat Sheet and regex syntax reference. Doing this in code instead? See the hashing and security endpoints.

Regex Pattern Library

Browse 35+ ready-to-use patterns. Click any pattern to load it into the tester below.

Generate with AI

Describe what you want to match in plain English. Requires your own API key -- stored only in your browser, never sent to our servers.

AI Provider

API Key(stored locally only)

Your API key stays in this browser. We never see it and never send it to our servers. It is used only to call OpenAI directly.

Describe what you want to match

Enter your API key above to enable AI generation. The key is stored only in your browser.

What is AI Regex Generator?

Free online AI regex generator to find the perfect regex pattern from a curated library of 35+ common patterns for emails, URLs, phone numbers, dates, credit cards, UUIDs, and more.

How to Use AI Regex Generator

1Browse the pattern library by category or search for a specific pattern

2Click any pattern to load it into the tester with example text

3Paste your own text in the test area to see matches highlighted

4Optionally, enter your API key and describe a custom pattern in plain English to generate one with AI

Frequently Asked Questions

Do I need an API key to use this tool?

Is my API key safe?

How do I generate a regex from a plain English description?

Can I test the generated regex patterns?

Yes. The tool includes a built-in tester where you can paste any text and see matches highlighted in real time. It shows match count, indices, and highlighted text for easy debugging.

Regex Pattern Library

Email Address

URL (http/https)

Domain Name

IPv4 Address

IPv6 Address

MAC Address

Slug (URL-friendly string)

Integer

Decimal / Float

Hex Color Code

Percentage

Currency (USD)

Phone Number (US)

Phone Number (International)

Date (YYYY-MM-DD)

Date (MM/DD/YYYY)

Date (DD/MM/YYYY)

Time (24h)

Time (12h with AM/PM)

ISO 8601 DateTime

Credit Card Number

SSN (US Social Security)

ZIP Code (US)

UUID

Strong Password

Username

HTML Tags

Markdown Links

Hashtags

Quoted Strings

Words (alphabetic only)

Whitespace (multiple spaces)

Emoji

JWT Token

Base64 String

API Key Pattern

File Extension

File Path (Unix)

Semantic Version

Image File Name

Generate with AI

Test Your Pattern

What is AI Regex Generator?

How to Use AI Regex Generator

Frequently Asked Questions

Do I need an API key to use this tool?

Is my API key safe?

How do I generate a regex from a plain English description?

Can I test the generated regex patterns?

Which common patterns are included without AI?

Related Tools

Regex tester online

Glassmorphism generator

Regex debugger

Complementary colors

htaccess Generator

Json tree viewer

Google font pairing

Cidr calculator

Regex Pattern Library

Email Address

URL (http/https)

Domain Name

IPv4 Address

IPv6 Address

MAC Address

Slug (URL-friendly string)

Integer

Decimal / Float

Hex Color Code

Percentage

Currency (USD)

Phone Number (US)

Phone Number (International)

Date (YYYY-MM-DD)

Date (MM/DD/YYYY)

Date (DD/MM/YYYY)

Time (24h)

Time (12h with AM/PM)