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Regular Expression Pattern Library Browse and copy common regex patterns for emails, URLs, phones, and more.

Regex Generator illustration
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Regex Generator

Browse and copy common regex patterns for emails, URLs, phones, and more.

1

Search or Browse

Search for a pattern or browse the categorized list.

2

Review Pattern Details

Check the pattern string and description to confirm it matches your target format.

3

Copy Pattern

Copy the regex pattern for use in your code.

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What Is Regex Generator?

A Regex Generator is a software tool that provides a library of pre-defined regular expression patterns for common tasks such as email validation, phone number parsing, and URL matching. Developers and data analysts use it to simplify their workflow when working with text data. One specific problem it solves is the tedious process of writing regex patterns from scratch, which can be prone to errors and time-consuming.

The tool includes a wide variety of patterns, including regex for email validation, regex phone number pattern, and date formats, making it a valuable resource for developers who need to parse and validate user input. What makes this tool different is its search functionality, which allows users to quickly find the desired pattern by searching for keywords in the pattern's label or description.

It also features a copy-to-clipboard function, enabling users to easily integrate the patterns into their code or other tools. For instance, the regex generator includes patterns for common tasks like matching IP addresses, hex colors, credit cards, and passwords, as well as more specialized tasks like parsing HTML tags, hashtags, and mentions. By providing these pre-defined regex patterns, it simplifies the process of text processing and validation, making it an essential resource for anyone working with regular expressions.

Why Use Regex Generator?

  • Save time with pre-built regex patterns
  • Avoid common regex mistakes with tested patterns
  • Searchable library for quick pattern lookup
  • One-click copy for immediate use

Common Use Cases

Development

Quickly grab regex patterns for input validation in your applications.

Data Extraction

Find patterns for extracting specific data types from text.

Form Validation

Validated regex patterns streamline form field checks.

Learning

Study common patterns to improve your regex skills.

Technical Guide

The library contains over 20 curated regex patterns organized with name, pattern string, and description. Patterns follow JavaScript syntax but are generally compatible with other engines (PCRE, Python, etc.). The search feature filters patterns by name and description using case-insensitive string matching. Each pattern can be copied to the clipboard with a single click. Patterns use standard features like character classes, quantifiers, alternation, lookahead, and capturing groups. Some patterns like the password validator use lookahead assertions for multiple simultaneous conditions.

Tips & Best Practices

  • 1
    Search by what you want to match (email, phone, date, etc.)
  • 2
    These patterns work in JavaScript and most other languages
  • 3
    Test copied patterns with the Regex Tester tool
  • 4
    Patterns may need boundary or flag adjustments for production use cases

Related Tools

Frequently Asked Questions

Q Are these patterns production-ready?
They cover common cases but may need adjustment for edge cases in production environments.
Q Do the patterns work in Python/Java/other languages?
Most patterns use standard regex syntax compatible across languages. Some JavaScript-specific features may need adaptation.
Q Can I request a new pattern?
No, but the library already covers the most commonly needed patterns. For custom patterns, use the Regex Tester to build and test your own.
Q How do I use a copied pattern?
Paste the pattern into your code as a regex literal (e.g., /pattern/flags in JavaScript) or as a string for RegExp constructor.
Q Are the patterns case-sensitive?
Most patterns match specific cases. Add the i flag when you need case-insensitive matching.

About This Tool

Regex Generator is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.