AI Regex Tester & Builder
Test regex patterns, describe a pattern in plain English, and search a library of known patterns by intent.
Test regex patterns with live highlighted matches, capture groups, and a replace preview. Describe a pattern in plain English and let AI draft a regex. Search a vector-indexed library of common patterns by intent. Sign in to save your personal regex collection.
When to use it
- 1Building or debugging a regex against a real test string.
- 2Asking 'what is the regex for matching ____' and getting a draft you can refine.
- 3Looking up a known pattern (email, URL, credit card) by description rather than memory.
How it works
- 1
Pattern and flags
Type a regex with separate flag toggles. The test string highlights every match in real time.
- 2
AI describe-to-regex
Type 'match credit cards with optional dashes' - AI returns a candidate regex with an explanation and edge-case warnings.
- 3
Semantic library search
Search a built-in library of common patterns by meaning. Click any to load it into the tester.
Frequently asked
Which regex flavor?
JavaScript / ECMAScript regex - the same engine your browser uses. Most patterns translate to PCRE with minor tweaks.
How accurate is the AI draft?
Good as a starting point but always test it against your real data. The tool warns about common edge cases automatically.
Want a tool just like this, but yours?
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