✓ Custom generation✓ 25+ presets✓ Live tester

Free Regex Generator Online

Q: How does the regex generator work?

Type what you want to match in plain English. The tool searches its pattern library and returns the best matching regex with an explanation.

Q: Can I test the regex?

Yes. Paste sample text in the test area to see matches highlighted in real time.

Q: Can it generate a custom regex for any request?

It uses a curated library of patterns. If there is no exact match, choose the closest pattern and edit it.

Describe what you want to match in plain English. Get a regex pattern with explanation and live tester.

What do you want to match?

Email Address

Matches standard email addresses like user@example.com

URL / Website

Matches HTTP and HTTPS URLs

Phone Number

Matches international phone numbers in various formats

IPv4 Address

Matches valid IPv4 addresses (0.0.0.0 - 255.255.255.255)

Date (YYYY-MM-DD)

Matches ISO date format

Date (MM/DD/YYYY)

Matches US date format

Hex Color Code

Matches 3 or 6 digit hex color codes

Credit Card Number

Matches Visa, MasterCard, Amex, and Discover card numbers

US Zip Code

Matches 5-digit and ZIP+4 formats

Indian PIN Code

Matches 6-digit Indian PIN codes

SSN

Matches US Social Security Numbers

Time (24h)

Matches 24-hour time format

Email Address

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

Matches standard email addresses like user@example.com

Test Pattern

0 matches found

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How to use Regex Generator

Three steps. Instant results.

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Step 1

Describe starts-with, ends-with, contains, character type, and length constraints.

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Step 2

Use the generated expression or select a structured-format preset.

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Step 3

Test positive and negative samples before copying.

How Regex Generator works

The generator parses common natural-language constraints and composes anchored JavaScript regex fragments for literals, character classes, and length quantifiers. A curated library handles structured formats such as email, URL, IP address, dates, UUIDs, and postal codes. The tester compiles the expression with JavaScript RegExp and highlights matches.

Why use this Regex Generator?

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Custom expressions from composable constraints

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25+ curated structured-format presets

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Live tester with highlighted matches

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One-click copy of patterns

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100% free, no signup

Frequently asked questions

How does the regex generator work?

It parses common constraints such as starts with, ends with, contains, character type, and length, then composes a JavaScript regex. Reliable presets cover common structured formats.

Is this regex tool free?

Yes. It is free with no signup or limits.

Can I test the regex?

Yes. Paste sample text to see matches highlighted in real time.

Can it generate a custom regex for any request?

It handles common composable requirements and shows what it understood. Highly specialized grammars still require manual review.

Which regex flavor is used?

The tester uses JavaScript RegExp syntax.

Is my text uploaded?

No. Matching and highlighting happen locally in your browser.

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