AI Regex Generator

A regular expression is a sequence of characters that defines a search pattern. Regex is used in programming, text editors, and command-line tools to find, match, and manipulate text. Common use cases include validating email addresses, extracting phone numbers, parsing log files, and performing search-and-replace operations.

Describe what you want to match in plain English — like "email addresses" or "dates in YYYY-MM-DD format" — and the AI analyzes your description to generate the appropriate regex pattern. It also provides an explanation of each part of the pattern so you can learn and modify it.

The live testing area uses JavaScript's built-in RegExp engine. The generated patterns are generally compatible with most regex flavors including Python, Java, PHP, and .NET. For language-specific features like lookbehinds or named groups, specify your target language in your description.

Yes, completely free with no signup required. The AI regex generation uses our free API and the live testing runs entirely in your browser. There are no usage limits, no accounts, and no hidden fees.

Absolutely. Paste your test text into the "Test Your Pattern" area and matches are highlighted in real-time as you type. You can also toggle regex flags (global, case-insensitive, multiline) to fine-tune matching behavior. The match count updates instantly.