📖 What is Regex Generator?
Regex Generator helps you build regular expressions by analyzing text examples or by constructing patterns with a visual interface. Describe what you want to match, test against sample text, and refine the pattern. Use it when you know what text you want to match but not the regex syntax. Everything runs in your browser.
💡 Example
Input
Match: dates like 2026-06-15, 2025-01-30
🛠️ Common Use Cases
- Building regex patterns from text examples
- Creating validation patterns for email, phone, dates and URLs
- Generating regex for log parsing and data extraction
- Learning regex syntax with interactive feedback
- Building search patterns for find-and-replace operations
📝 Common Regex Patterns
\d{4}-\d{2}-\d{2} — date (YYYY-MM-DD)[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,} — email\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b — IPv4 addresshttps?://[^\s]+ — URL
⚠️ Common Mistakes
- Not escaping special characters — characters like
. * + ? ( ) [ ] { } have special meaning. Escape with backslash for literal matching. - Greedy vs lazy matching —
.* is greedy (matches as much as possible). Use .*? for lazy (matches as little as possible). - Over-complex patterns — if a regex is unreadable, break it into smaller patterns or use multiple validation steps.
❓ Frequently Asked Questions
Can I test my regex against sample text? ▾
Yes — paste your regex and test text to see matches highlighted in real time.
What is the difference between greedy and lazy matching? ▾
.* is greedy — it matches as much text as possible. .*? is lazy — it matches as little as possible. Use lazy matching when you want the shortest match.
How do I match special characters literally? ▾
Escape them with a backslash: \. matches a literal dot, \( matches a literal parenthesis.
Is my data private? ▾
Yes — all processing runs entirely in your browser. Your data is never sent to any server.
Is this tool free? ▾
Completely free — no login, no usage limits, works offline once loaded.
Yes — completely free, no login required, no usage limits.
Is my data private? ▾
Yes — all processing runs in your browser. Your data is never sent to any server.
Does it work offline? ▾
Yes — once the page is loaded, the tool works without an internet connection.