Regex Utilities

Get Password Pattern

Generates regex patterns for password validation with customizable requirements like minimum length, character types, and complexity rules. Access via MCP in Cursor or Windsurf, or REST at `/v1/regex/pattern/password`. Example: specify 8+ chars with uppercase, lowercase, and numbers to get `^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[A-Za-z\d]{8,}$`. Returns deterministic patterns that work across programming languages.

API Endpoint

GET /v1/regex/pattern/password

Code Examples

curl "https://tinyfn.io/v1/regex/pattern/password" \
  -H "X-API-Key: YOUR_API_KEY"
const response = await fetch('https://tinyfn.io/v1/regex/pattern/password', {
  headers: { 'X-API-Key': 'YOUR_API_KEY' }
});
const data = await response.json();
console.log(data);
import requests

response = requests.get('https://tinyfn.io/v1/regex/pattern/password',
    headers={'X-API-Key': 'YOUR_API_KEY'})
data = response.json()
print(data)

Use via MCP

Add to your AI agent

Connect your AI agent (Claude, Cursor, Windsurf, etc.) to TinyFn's regex tools:

{
  "mcpServers": {
    "tinyfn-regex": {
      "url": "https://tinyfn.io/mcp/regex",
      "headers": {
        "X-API-Key": "YOUR_API_KEY"
      }
    }
  }
}

Learn more about MCP setup →

Related Tools

Test Pattern
Test if a regex pattern matches text.
Find All Matches
Find all matches of a pattern in text.
Regex Replace
Replace pattern matches in text.
Regex Split
Split text by regex pattern.
Validate Pattern
Validate if a regex pattern is syntactically correct.
Escape Pattern
Escape special regex characters in text.
Extract Groups
Extract capture groups from a pattern match.
Get Email Pattern
Get regex pattern for email validation.

FAQ

How do I generate a password regex pattern with specific requirements?

Call the endpoint with parameters for minimum length, required character types (uppercase, lowercase, numbers, symbols), and any custom rules. It returns a tested regex pattern ready for validation.

Can I use this password regex generator in my MCP-enabled AI coding assistant?

Yes, it's available as an MCP tool in Cursor, Claude Code, Windsurf, and other supported editors. Your AI assistant can generate password patterns directly during code reviews or development.

What's the difference between this and writing my own password regex?

This generates tested, cross-language compatible patterns and handles complex lookaheads correctly. It prevents common regex mistakes like incorrect character class ordering or lookahead syntax errors.

Does the password pattern generator support custom character sets?

Yes, you can specify custom allowed/required characters beyond standard alphanumeric and symbols. Useful for systems with specific character restrictions or requirements.

Are the generated password regex patterns secure against common bypass attempts?

The patterns use proper lookaheads and anchoring to prevent common bypasses like partial matches or edge case characters. However, always combine regex validation with proper password hashing and storage practices.

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