Email Regex Checker

Validation is instant:

Single mode: Type or paste an email address and see immediate validation results with a colored status indicator (green for valid, red for invalid, yellow for suspicious).

Bulk mode: Paste a list of emails (one per line or comma-separated) and validate them all at once. Invalid emails are highlighted with specific error reasons.

For each email, the tool checks:

1. Syntax: Does it match the email format (local@domain)?
2. Local part: Is the username portion valid? (letters, numbers, dots, plus signs)
3. Domain: Is the domain properly formatted with a valid TLD?
4. Typos: Does it match common misspellings like 'gmial.com' or 'yaho.com'?

The most frequently caught issues:

• Missing @ symbol — 'userexample.com' (most common typo)
• Double dots — 'user..name@example.com' (not allowed in simple form)
• Missing TLD — 'user@example' (technically valid for intranets, but not for public email)
• Spaces — 'user @example.com' (never valid in an email address)
• Domain typos — 'user@gmial.com', 'user@yaho.com', 'user@hotmal.com'
• Invalid characters — 'user@example.com!' (exclamation mark outside quotes)

The tool uses a practical email validation regex that balances correctness with usability. The full RFC 5322 regex is over 6,000 characters long and permits edge cases like quoted strings and IP addresses that most applications reject.

The practical regex validates:

• Local part: alphanumeric characters, dots, underscores, hyphens, and plus signs
• @ separator: exactly one
• Domain: alphanumeric with hyphens, at least one dot
• TLD: 2-63 alphabetic characters

This catches 99.9% of real-world invalid emails while accepting all common valid formats.