Claude Sonnet via x402 Gateway

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      "role": "user",
      "content": "Write a Python function that validates email addresses using regex and returns True if valid, False otherwise. Include docstring and example usage."
    }
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  "content": "```python\nimport re\n\ndef validate_email(email):\n    \"\"\"\n    Validates an email address using regular expression pattern matching.\n    \n    This function checks if an email address follows the standard format:\n    - Local part (before @): alphanumeric characters, dots, hyphens, underscores\n    - @ symbol (required)\n    - Domain name: alphanumeric characters and hyphens\n    - Top-level domain: 2-6 alphabetic characters after a dot\n    \n    Args:\n        email (str): The email address string to validate\n        \n    Returns:\n        bool: True if the email is valid, False otherwise\n        \n    Examples:\n        >>> validate_email(\"user@example.com\")\n        True\n        >>> validate_email(\"john.doe123@company.co.uk\")\n        True\n        >>> validate_email(\"invalid.email@\")\n        False\n        >>> validate_email(\"@example.com\")\n        False\n        >>> validate_email(\"user@domain\")\n        False\n    \"\"\"\n    # Regular expression pattern for email validation\n    pattern = r'^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,6}$'\n    \n    # Return True if pattern matches, False otherwise\n    if re.match(pattern, email):\n        return True\n    return False\n\n\n# Example usage\nif __name__ == \"__main__\":\n    # Test cases\n    test_emails = [\n        \"user@example.com\",           # Valid\n        \"john.doe@company.co.uk\",     # Valid\n        \"test_email123@domain.org\",   # Valid\n        \"name+tag@example.com\",       # Valid with + (extended pattern)\n        \"invalid.email@\",             # Invalid - no domain\n        \"@example.com\",               # Invalid - no local part\n        \"user@domain\",                # Invalid - no TLD\n        \"user name@example.com\",      # Invalid - space in local part\n        \"user@.com\",                  # Invalid - missing domain name\n        \"user@@example.com\",          # Invalid"
}