How it works
- 1
Describe your pattern in plain English
Type what you want to match — e.g. "all email addresses" or "ISO dates in YYYY-MM-DD format".
- 2
Choose your language and click Generate
Pick JavaScript, Python, PCRE, or Go. The AI returns the regex plus a step-by-step breakdown of each part.
- 3
Test it live before copying
Paste sample text into the live tester to see exactly which parts match — then copy to your code.
New to regex?
A regular expression (regex) is a pattern that matches text — like a “smart Find”. You need one when validating email addresses, extracting phone numbers from logs, routing HTTP requests, or scrubbing secrets from config files. Instead of learning the syntax, just describe what you want to match in plain English above.
Regex Generator
Pick from common patterns or type your own regex, then test it live.
Engine
Common patterns — click to load
Pattern library
8 common patterns ready to load — email, URL, phone, UUID, IP, date, and more.
Instant results
Type or paste a pattern and see formatted output for your chosen engine immediately.
Live test sandbox
Paste sample text and see matches highlighted in real time — right in your browser.
Example prompts & outputs
“Match a valid email address”JavaScript
/^[\w.-]+@[\w.-]+\.[a-zA-Z]{2,}$/“Extract all environment variable keys starting with NEXT_PUBLIC_”JavaScript
/^NEXT_PUBLIC_[A-Z0-9_]+(?==)/gm
“Validate an ISO date in YYYY-MM-DD format”Python
/^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])$/“Match a semantic version number like 1.2.3”Go
/^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)$/
“Find all HTTP 4xx error lines in an nginx log”PCRE
^(?:\S+\s+){8}4\d{2}\s🛡️ Verify zero uploads — open DevTools → Network tab
Open your browser's DevTools (F12), go to the Network tab, and use this tool. You will see zero outbound requests — all processing runs inside your browser sandbox via WebAssembly or pure JavaScript. Nothing you paste or upload is ever sent anywhere.
Use cases
Input validation
"Match a valid Australian phone number in +61 format" — get a production-safe regex in seconds.
Log file parsing
"Find all HTTP 4xx error lines in an nginx access log" — extract exactly what you need.
Data extraction
"Extract all ISO dates from a CSV file" — turn a plain description into a working extraction regex.
Frequently Asked Questions
What data is sent to the AI API?
Only the plain-English description you type in the prompt box. No file contents, no personal data, no context from other tools. The actual strings you test against the regex stay entirely in your browser.
Which regex flavors are supported?
JavaScript (ECMAScript), Python (re module), PCRE (PHP, Ruby, Java), and Go (regexp package). The tool generates the correct syntax and flag options for each engine.
What is a regex and when do I need one?
A regular expression (regex) is a pattern that matches text. You need one when validating email addresses, extracting phone numbers from logs, finding all URLs in a document, scrubbing PII from datasets, or routing HTTP requests by URL pattern.
How accurate is the generated regex?
The AI generates a best-effort regex with a plain-English explanation of each part. Always test it against your real data using the built-in live tester before using it in production.
Is this free to use?
Yes. The AI Regex Generator is free with a daily usage limit. Pro subscribers get unlimited generations.
Want unlimited access + saved history?
Pro is $6/month · 30-day money-back guarantee.
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