Test Regex for Form Validation

Write and test regular expressions for validating emails, phone numbers, postcodes, and other form inputs.

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Regular expression

//g

Flags:

Examples:

Test text

Matches

The quick brown fox jumps over the lazy dog. Pack my box with five dozen liquor jugs.Enter a pattern above to see matches highlighted here.

Form Validation tips

📋

Test your validation pattern against both valid and invalid inputs before adding it to your code. Edge cases are easy to miss.

📧

Email validation regex is surprisingly complex. A practical pattern: ^[^\s@]+@[^\s@]+\.[^\s@]+$ — simpler patterns catch most real addresses.

📱

Phone number formats vary by country. Consider whether to validate format or just digits — stricter validation can frustrate international users.

💡

Use named capture groups (?<year>\d{4}) to extract parts of matched strings in your validation code.

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