AI Regex Generator
Powered by AIDescribe what you want to match in plain English and get a regex pattern with step-by-step explanation. Test it instantly against your own text.
Describe what you want to match above and click “Generate Regex” to get a pattern with explanation.
Regex Quick Reference
Character Classes
\d matches digits, \w matches word characters (letters, digits, underscore), \s matches whitespace. Uppercase versions (\D, \W, \S) match the opposite.
Quantifiers
* means 0 or more, + means 1 or more, ? means 0 or 1. {n} matches exactly n times, {n,m} matches between n and m times.
Anchors
^ matches the start of a string (or line with m flag), $ matches the end. \b matches a word boundary.
Groups & Alternation
( ) creates a capture group, (?: ) creates a non-capturing group. | means OR between alternatives.
Common Flags
g = global (find all matches), i = case-insensitive, m = multiline (^ and $ match line boundaries), s = dotAll (. matches newlines).
Lookahead & Lookbehind
(?=...) positive lookahead, (?!...) negative lookahead. (?<=...) positive lookbehind, (?<!...) negative lookbehind.
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Frequently Asked Questions
How does the AI Regex Generator work?
You describe what you want to match in plain English (e.g., “match email addresses” or “extract phone numbers”). The AI analyzes your description and generates a regular expression pattern with flags, a step-by-step explanation, and example matches and non-matches. You can then test the pattern against your own text right in the browser.
Is the generated regex reliable?
The AI generates patterns based on common regex conventions and your description. While it works well for most use cases, you should always test the generated pattern against your actual data using the built-in test feature. Complex or edge-case-heavy patterns may need manual refinement.
How many regex patterns can I generate per day?
You can generate up to 5 regex patterns per day for free. The limit resets at midnight. Each generation provides the pattern, explanation, example matches, and a live testing area.