📧 Email Regex Tester
Professional email validation tool that tests email addresses against custom regex patterns. Features common email regex presets, pattern analysis, educational examples, and detailed match results for development and marketing validation.
Email Validation Results:
user@example.com ✓ Valid Email
Matches standard email pattern
🔍 Pattern Analysis
⚡ Regex Pattern Breakdown
📈 Validation Summary
Standard structure
Regex validated
Common format
How to Use This Email Regex Tester
How to Use the Email Regex Tester:
- Enter the email address you want to test against regex patterns
- Choose a preset regex pattern or enter your custom pattern
- Select options like pattern breakdown and email part extraction
- Click "Test Email Pattern" to see detailed validation results
Pro Tips: Use the pattern breakdown feature to understand how your regex works. Enable email part extraction to see the local part and domain separately when the email is valid.
How It Works
Advanced Email Regex Testing Technology:
Our tester uses JavaScript RegExp to validate email addresses against patterns:
- Pattern Matching: Tests your email against the selected regex pattern
- Component Analysis: Extracts local part (username) and domain when valid
- Pattern Breakdown: Explains regex components for educational purposes
- Preset Patterns: Includes RFC-compliant and common validation patterns
Important Note: Regex validation only checks format. True email validation requires SMTP checking to verify the address actually exists.
When You Might Need This
- • Web developers validating user registration forms with custom email patterns
- • Marketing teams cleaning email lists and identifying invalid addresses before campaigns
- • Data analysts testing different regex patterns for email extraction from datasets
- • Students learning regular expressions through practical email validation examples
- • QA testers verifying email validation logic in web applications and mobile apps
- • Email service providers implementing custom validation rules for domain restrictions
- • Database administrators cleaning customer email data with pattern-based validation
- • API developers testing email validation endpoints with various regex configurations
- • Security researchers analyzing email patterns for spam detection and filtering systems
- • Content managers validating newsletter subscriber emails with strict formatting requirements
Frequently Asked Questions
What's the difference between the preset email regex patterns?
Standard pattern follows RFC guidelines for most common emails, Simple pattern does basic validation, Strict pattern is very restrictive for high-security applications, Permissive allows more unusual formats, and Domain-Strict validates top-level domains specifically.
Can I test multiple email addresses at once?
Currently the tool tests one email at a time for detailed analysis. For batch processing, you can copy results and test each email individually to compare how different addresses match your regex pattern.
Why does my custom regex pattern show unexpected results?
Common issues include: forgetting to escape special characters (use \. for literal dots), not anchoring the pattern (add ^ and $), or case sensitivity settings. Use the pattern breakdown feature to understand how your regex is interpreted.
Is regex enough for complete email validation?
No, regex validation only checks format. True email validation requires SMTP checking to verify the address exists and accepts mail. Regex is best for initial format validation before more expensive verification methods.
How do I create a regex pattern for specific domains only?
Modify the domain part of the pattern: ^[a-zA-Z0-9._%+-]+@(company\.com|allowed\.org)$ This example only allows company.com and allowed.org domains. Remember to escape dots with backslashes.