Devstral Code LLM via x402 Gateway

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      "content": "Write a Python function that validates email addresses using regex and returns True if valid, False otherwise. Include error handling for edge cases."
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  "content": "# Python Function to Validate Email Addresses Using Regex\n\nHere's a Python function that validates email addresses using regular expressions with proper error handling:\n\n```python\nimport re\n\ndef validate_email(email):\n    \"\"\"\n    Validates an email address using regex pattern matching.\n\n    Args:\n        email (str): The email address to validate\n\n    Returns:\n        bool: True if the email is valid, False otherwise\n\n    Raises:\n        TypeError: If the input is not a string\n    \"\"\"\n    # Error handling for non-string inputs\n    if not isinstance(email, str):\n        raise TypeError(\"Input must be a string\")\n\n    # Empty string check\n    if not email:\n        return False\n\n    # Regular expression pattern for email validation\n    pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}$'\n\n    try:\n        # Compile the regex pattern\n        regex = re.compile(pattern)\n\n        # Check if the email matches the pattern\n        if regex.fullmatch(email):\n            return True\n        return False\n\n    except re.error:\n        # Handle potential regex compilation errors\n        return False\n```\n\n## Explanation:\n\n1. **Error Handling**:\n   - Checks if input is a string (raises TypeError if not)\n   - Handles empty strings by returning False\n   - Catches potential regex compilation errors\n\n2. **Regex Pattern**:\n   - `^[a-zA-Z0-9._%+-]+` - Local part (before @) allows letters, numbers, and certain special characters\n   - `@` - The @ symbol\n   - `[a-zA-Z0-9.-]+` - Domain name (after @) allows letters, numbers, dots, and hyphens\n   - `\\.[a-zA-Z]{2,}$` - Top-level domain (after last dot) must be at least 2 letters\n\n3. **Validation**:\n   - Uses `fullmatch()` to ensure the entire string matches the pattern\n   - Returns True for valid emails, False otherwise\n\n## Example Usage:\n\n```python\n# Valid emails\nprint(validate_email(\"user@example.com\"))  # True\nprint(validate_email(\"first.last@sub.domain.co.uk\"))  # True\n\n# Invalid emails\nprint(validate_email(\"user@.com\"))  # False\nprint(validate_email(\"user@com\"))  # False\nprint(validate_email(\"user@com.\"))  # False\n\n# Edge cases\nprint(validate_email(\"\"))  # False\ntry:\n    print(validate_email(123))  # Raises TypeError\nexcept TypeError as e:\n    print(e)  # \"Input must be a string\"\n```\n\nThis function provides robust email validation while handling common edge cases and potential errors."
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