How It Works
Type a description like "email" or "phone number" to generate a regex pattern. The tool uses pre-built templates for common patterns. For complex patterns, use the Regex Tester tool for manual testing.
What is Natural Language Regex Generator?
Regular expressions (regex) are powerful pattern-matching tools used for validation, search, and text processing. However, regex syntax is complex and error-prone. This generator lets you describe patterns in plain English - 'email', 'phone number', 'URL' - and automatically produces tested regex patterns with code examples. Ideal for developers who need common patterns quickly without memorizing regex syntax.
How to Use
- Type a description: email, url, phone, ip address, date, etc.
- Or click a common pattern template below
- Generated regex appears with explanation
- Test the pattern with sample text
- Copy the regex or code examples for your project
Why Use This Tool?
Tips & Best Practices
- Try partial keywords: 'email' matches 'email address'
- Use pattern templates for quick access
- Test with real text to verify matches
- Enable 'i' flag for case-insensitive matching
- Enable "g" flag to find all matches (not just first)
- Copy code examples directly into your project
Frequently Asked Questions
What patterns can I generate?
Email addresses, URLs, phone numbers (US), IP addresses (IPv4), dates (YYYY-MM-DD), times (HH:MM), hex colors, UUIDs, usernames, passwords (strong format), credit card numbers, HTML tags, integers, floats, whitespace, and words. Each pattern is pre-tested and production-ready.
How accurate are generated patterns?
Patterns are battle-tested regex expressions used in production applications. They cover most common cases but may not handle every edge case. For specialized validation (like specific credit card brands), you may need to customize the pattern.
What regex flags should I use?
'g' (global) finds all matches, not just first. 'i' (case-insensitive) matches regardless of letter case. 'm' (multiline) treats each line separately for ^ and $ anchors. Most validation uses no flags; search operations typically use 'g' flag.
Can I customize generated patterns?
Yes - copy the pattern and modify it. For example, the email pattern can be restricted to specific domains, or the URL pattern can require https. Use the Regex Tester tool to test modifications before using in production.
How do I use regex in JavaScript?
const regex = new RegExp('pattern', 'flags') or const regex = /pattern/flags. Use str.match(regex) to find matches, regex.test(str) to check if match exists, str.replace(regex, replacement) to replace matches. The tool provides ready-to-use code examples.
What if my pattern isn't available?
The tool covers common patterns. For specialized needs, use the Regex Tester tool (/tools/backend/regex) to build and test custom patterns. Describe what you want to match, test with examples, and refine the pattern until it works correctly.