JSON Formatter
Format messy JSON into readable, indented output directly in your browser.
Open ToolRegex Tester
Test a regular expression against sample text and view matches.
About Regex Tester
Regex Tester tests regular expressions against sample text.
It helps you check matches before using a pattern in code, validation rules, search tools, or text processing tasks.
How to Use Regex Tester
- Enter the regex pattern.
- Paste sample text to test against.
- Run the match test.
- Review matches and adjust the pattern.
Common Use Cases
- Testing form validation patterns.
- Finding text matches in samples.
- Learning how regex changes affect results.
Frequently Asked Questions
What input should I paste into Regex Tester?
Paste the matching developer content for this tool, such as code, markup, encoded text, a timestamp, regex pattern, or metadata values.
When is Regex Tester useful?
It is useful for testing form validation patterns and finding text matches in samples.
Should I paste private secrets into Regex Tester?
Avoid pasting API keys, passwords, tokens, or private production data into any online tool, even when the processing is browser-based.