Password Regex Generator
Generate & Validate patterns for secure password policies
How to Generate Password Regex
Set Min/Max length requirements.
Toggle character sets and counts.
Copy Live Regex or Export Code.
Validate in the Testing Lab.
Reference Patterns
| Policy | Example | Snippet |
|---|---|---|
| Standard Security | abcXyz@12345 | ^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[^a-zA-Z0-9])(?!.*\s).{12,24}$ |
| Alphabets Only | abcdefXyzABC | ^[a-zA-Z]{12,24}$ |
| High Frequency Digits | abcXyz123jk | ^(?=.*\d{3})(?=.*[a-z]).{12,24}$ |
Entropy Analysis
| Type | Size | Bits/Char |
|---|---|---|
| Upper (A-Z) | 26 | 4.7 |
| Lower (a-z) | 26 | 4.7 |
| Digits (0-9) | 10 | 3.32 |
| Special Chars | 30 | 4.91 |
Our Password Regex Generator helps developers and security professionals create precise regular expressions for password validation. Whether you need a simple length check or complex requirements for character variety, this tool generates the pattern and provides a live tester to verify it instantly.
How to Use
- Set your minimum and maximum character length requirements.
- Toggle requirements for digits, uppercase, lowercase, and symbols.
- Specify the minimum count for each required character type.
- Use the generated Regex Pattern in your application code.
- Test potential passwords in the validator to ensure they meet your rules.
Features
- Dynamic Regex Generation based on custom rules
- Live Password Validation against the generated pattern
- Real-time Password Strength Meter and entropy calculation
- Support for repeating character restrictions
- Detailed English explanation of the generated regex
- Common password policy presets (Basic, Enterprise, Banking)
Common Use Cases
- Backend password validation logic implementation
- Frontend form validation for user registration
- Security policy definition for corporate systems
- Educational tool for learning regular expressions
- Auditing existing password policies
Tips & Best Practices
Modern standards recommend a minimum length of 12-16 characters.
Combining different character types significantly increases password entropy.
Password Entropy = log2(charset_size) * length of password.
Always test your regex with common edge cases (like spaces or extreme lengths).
Entropy bits above 60 are generally considered strong against brute force.