Free AI Regular Expression (Regex) Generator

Create regular expressions for pattern validation, string extraction, and text replacement with clear explanations.

Get a better first draft

• Provide sample matching strings and non-matching strings to test edges.
• Specify regex flavor (JavaScript/TypeScript, Python, PCRE) if using lookaheads.
• Use the provided breakdown to understand each token.

Length, formatting and free credits

Guests receive 5 credits per day. Sign in with your email for 20 daily credits and saved projects. Taglines use 5, 10 or 16 words per idea; headlines and subject lines have their own character limits. Longer drafts support up to 300 words for guests or 700 when signed in. Summaries stay shorter than the source. Optional explicit line limits apply only to replies and social captions. One generation or rewrite costs one credit; failed requests are refunded. Credits reset at midnight UTC.

Choose plain text, Markdown or WhatsApp formatting. Copy preserves the output’s line breaks and formatting markers. A line means an explicit line break, not wrapping on your phone.

Before you use the output

Regex can be prone to catastrophic backtracking on large strings; test against regex analyzers.

Your work stays yours to manage

Guest history stays in the current browser. Signed-in work is saved privately in the dashboard, where you can search all saved history, filter by tool, date and project, manage projects, continue editing, save versions or delete an item. Drafts are sent to our AI provider to generate the result. Do not submit passwords or sensitive personal data.

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