Free AI Developer Tool

Cloud processed

AI Regex Builder

Describe what you want to match in plain English — get the correct regular expression with a full explanation and a live tester to validate it instantly.

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Minimum 5 characters. Be specific — include format, edge cases, and examples where helpful.

Free to use · 500 character limit per request. Sign in for higher limits or add credits for unlimited access.

How It Works

1

Describe in Plain English

Write what you want to match in plain language — no regex knowledge required.

2

AI Generates the Pattern

Our AI creates the regex with a component-by-component explanation of what each part does.

3

Test & Validate

Use the built-in live tester to validate the pattern against your own strings instantly.

Tips for Better Results

Be specific about format

Describe the exact structure — e.g., "a 10-digit US phone number in the format (XXX) XXX-XXXX" rather than just "phone number".

Mention edge cases

If hyphens, dots, or spaces should be optional, say so. Spell out what should and should not match.

Choose the right flavor

Different languages have different regex syntax. Select JavaScript for browser code, Python for scripts, PCRE for nginx/Apache rules.

Use the live tester

Paste real examples from your data into the live tester to confirm the regex behaves exactly as expected before copying it.

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