Regex Utilities

Validate Pattern

Validates regex patterns for syntax correctness before execution, preventing runtime errors in your code. Use via MCP in Cursor or Windsurf, or call GET /v1/regex/validate with your pattern. Returns boolean validity plus detailed error messages for malformed expressions. Essential for dynamic regex construction where pattern correctness can't be guaranteed at compile time.

API Endpoint

GET /v1/regex/validate

Code Examples

curl "https://tinyfn.io/v1/regex/validate" \
  -H "X-API-Key: YOUR_API_KEY"
const response = await fetch('https://tinyfn.io/v1/regex/validate', {
  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/validate',
    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.
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.
Get Url Pattern
Get regex pattern for URL validation.

FAQ

How do I validate a regex pattern before using it?

Send a GET request to /v1/regex/validate with your pattern as a parameter. The API returns true/false validity plus error details if the pattern is malformed.

What regex flavors does the validator support?

The validator uses standard PCRE (Perl Compatible Regular Expressions) syntax, which is compatible with most programming languages including JavaScript, Python, and PHP.

Can I validate regex patterns in MCP-enabled editors?

Yes, use the validate pattern tool in Cursor, Claude Code, or other MCP clients to check regex syntax before implementing it in your code.

What happens when I validate an invalid regex pattern?

The tool returns false validity status along with a specific error message describing what's wrong with the pattern syntax, like unmatched brackets or invalid escape sequences.

Why validate regex patterns instead of just trying them?

Validation prevents runtime exceptions and helps catch syntax errors early, especially when building dynamic patterns from user input or configuration files.

Try Validate Pattern Now

Get your free API key and start using Validate Pattern in seconds.

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