Regex tester
Declare JavaScript flavor and flags.
Up to 1,000,000 characters. Review the settings before running.
Your result
How to use Regex tester
- Enter your text in the input field.
- Review the settings, then choose Run Regex tester.
- Review the result, then use Copy result or a download link when available.
Useful next steps
Working with regex tester
Formatting makes existing data or code easier to read. Validation checks whether it follows a syntax or schema. Conversion maps it into another representation. Choosing the right operation helps avoid treating a neatly formatted result as proof that the underlying data is correct.
Common questions
Does valid JSON mean the data is correct?
Syntax validation only establishes that the text can be parsed as JSON. A schema can check required fields and types, but neither proves that an email address, price or external record is factually correct.
Is decoding the same as decrypting or verifying?
No. Base64 and URL encoding are representations, not encryption. Reading a token payload does not verify its signature. Use the specific validation or verification process required by the system receiving the result.
Continue your workflow: Find and replace, Extract urls, JSON validator.