What validation checks would you implement for an email field?
Tests your understanding of practical validation vs. theoretical purity. A great answer prioritizes user experience, uses simple syntax checks (like a single '@'), and relies on sending a verification email as the ultimate test.
This tests your grasp of the trade-offs between strict validation and user experience. A senior answer avoids overly complex regex, which often rejects valid emails. Instead, outline a multi-stage process: first, simple synchronous checks (presence of one '@'); second, an asynchronous verification step (sending a confirmation link), which is the most reliable method. The red flag is immediately suggesting a 'perfect' RFC-compliant regex, ignoring practical usability.
Read the original → Wikipedia: Email address
- #data quality
- #validation
- #user input
- #backend
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