Regular Expression Generator

No login, no cost. Describe the pattern you want to match in plain English above, and get a working regular expression in seconds.

Regular expressions are powerful and famously hard to remember. The free AI Regex Generator writes them for you: describe what you want to match (an email address, a phone number, everything between two tags) in plain English, and it returns a regex pattern you can drop into your code, a find-and-replace, or a validation rule.

How to Use the Free Regex Generator

1. Describe the pattern in plain English, like “match a US phone number” or “find everything inside square brackets.”
2. Click Generate and the tool writes the regular expression for you.
3. Copy the regex into your editor, validator, or find-and-replace box.
4. Test it against real samples and, if it misses an edge case, add detail to your description and generate again.

Regex Patterns You Can Generate

Here are some everyday requests and the patterns you would get back:

• “Match an email address” → [A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}
• “Match a US phone number” → \(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}
• “Match any URL” → https?:\/\/[^\s]+
• “Match a date in YYYY-MM-DD format” → \d{4}-\d{2}-\d{2}
• “Match a hex color code” → #[0-9A-Fa-f]{6}
• “Extract every number from a block of text” → \d+

Generate vs. Test: How This Fits With Tools Like Regex101

This tool is built to create a pattern from a plain-English description. Once you have one, a dedicated tester like regex101 or RegExr is the best way to debug it against real strings and see exactly what each token matches. The two work well together: generate the pattern here, then test and fine-tune it there.

Regex Generator FAQs

Is the regex generator free?

Yes. Generating patterns is free and needs no account. Sign up free if you want to keep a library of the regex you have built and reach for it later.

Do I need to know regex to use it?

No. You describe what you want to match in plain English and the tool writes the pattern. It is a good way to learn, too, since you can compare the description you gave with the regex it produced.

Does it work for JavaScript, Python, and PHP?

Mostly, yes. Core regex syntax is shared across languages, though flavors differ in small ways (lookbehind support, named groups, escaping). If you are targeting a specific language, mention it in your description and test the result in that environment.

Will the pattern always be perfect?

It handles common patterns well, but regex is full of edge cases. Always test the output against real data before shipping it, especially for validation rules where a missed case matters. Give the tool concrete examples of what should and should not match for the best results.