ExpertValidation
Strict IPv4 Address Validator
Write a regex that validates an IPv4 address, ensuring each of the four dot-separated octets is a real number between 0 and 255, rather than just any string of digits.
Need a syntax reminder? Read our detailed guide on the Strict IPv4 Address Validator Regex Pattern.
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192.168.1.1 / 255.255.255.255 / 0.0.0.0 / 256.1.1.1 / 192.168.1 / 999.999.999.999
Test cases
- 192.168.1.1expect match
- 255.255.255.255expect match
- 0.0.0.0expect match
- 256.1.1.1expect no match
- 192.168.1expect no match
- 192.168.1.1.1expect no match
- 999.999.999.999expect no match
How to Solve this Regex Challenge
To complete the Strict IPv4 Address Validator challenge, you must write a regular expression pattern that satisfies all specified test cases.
Steps to Complete:
- Analyze the Requirements: Read the description and review the list of test cases below. Identify which strings must be matched (green markers) and which must be rejected (red markers).
- Draft Your Pattern: Enter your regex in the interactive editor. Use the provided Hint button if you get stuck.
- Verify: The test cases panel will update in real-time as you type, showing which strings match your current expression.
- Review the Solution: Once you successfully pass all test cases, review the explanation to understand the logic behind the solution.