Regex Generator

Build regular expressions visually without memorizing syntax. Create and test regex patterns for email, phone, URL validation and more.

Quick Presets

Pattern Builder

Flags

Global (g)Case Insensitive (i)Multiline (m)

Generated Regex

//g

Test Your Pattern

How this Regex Generator works

This developer tool enables visual construction of regular expressions without memorizing complex syntax. Users build patterns by adding components—digits, word characters, whitespace, letters, and custom patterns—then applying quantifiers like optional, one-or-more, or specific ranges to control matching behavior.

The generator provides preset patterns for common validation tasks including email addresses, phone numbers, URLs, dates, IP addresses, and credit card formats. Each preset loads immediately for quick testing or modification. Flag options control global matching, case sensitivity, and multiline behavior, producing complete regex strings ready for use in any programming language.

A live testing area validates generated patterns against user-provided text, highlighting matches in real-time. This immediate feedback helps developers refine patterns before implementation. The tool supports all standard regex features including anchors, character classes, and quantifiers, making it suitable for both simple validations and complex text processing requirements.

How to Use

Add Pattern Parts

Build your regex by adding components like digits, letters, or custom patterns

Set Quantifiers

Define how many times each part should match

Test & Copy

Test against sample text and copy your regex

Example Usage

Common email validation regex:

Input

Pattern: Email Address

Output

^[\w.-]+@[\w.-]+\.[a-zA-Z]{2,}$

Frequently Asked Questions

What is a regular expression?

A regular expression (regex) is a sequence of characters that defines a search pattern. It is commonly used for string matching and validation.

How do I test my regex?

Enter any test string in the testing area below. Matches will be highlighted, helping you verify your pattern works correctly.

Can I use these patterns in my code?

Yes! The generated regex is compatible with JavaScript, Python, Java, and most other programming languages that support regular expressions.

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The Regex Generator is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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