Contract-Based Email Validator Prompt
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Feb 10, 2026
Contract-Based Email Validator Prompt A structured prompt template for generating production-ready code with explicit goals, constraints, format, and failure criteria, tested against a simple prompt for better results.
Prompt ContentSave
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Generate Python function to validate email addresses.
GOAL: Process 50K emails/sec, 99.9% accuracy
CONSTRAINTS: No regex libraries, max 30 lines, Python 3.10+
FORMAT: Function + type hints + docstring + 5 test cases
FAILURE: If uses external libs OR lacks error handling OR runs >20ms per 1K emails
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Usage
This prompt is designed for use with coding. Copy the prompt content above and paste it into your preferred AI tool.
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References
- Category: coding Prompts
- Source: https://x.com/MillieMarconnni/status/2021177812670128327
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