About Regex Tester
Enter a pattern without slash delimiters, add supported flags and test text. Matches are highlighted and capped to protect the interface.
How to use this tool
- Enter a JavaScript pattern without surrounding slashes and add valid flags.
- Paste representative test text of up to 10,000 characters.
- Run the test, inspect highlights and add edge cases before using the expression.
Examples and practical guidance
Use \b[A-Z]\w+ with the g flag to find capitalised words, then add cases for punctuation, Unicode and empty input.
Useful tips and common mistakes
Nested repetition patterns and oversized inputs are blocked because catastrophic backtracking can freeze a browser. Test against representative edge cases before deployment.
Detailed information
Test a JavaScript regular expression, flags and matches against sample text. It is designed for focused, everyday work on desktop and mobile. Processing stays in the browser, so Devyar does not receive the content you enter into the tool.
Results should still be reviewed in the context where they will be used. Keep original source material when converting files or transforming code.
Frequently asked questions
Is the Regex Tester free to use?
Yes. You can use this Devyar tool without creating an account.
Does Devyar receive the data I enter?
No. The tool runs in your web browser and does not submit your input or result to Devyar. Standard page analytics, when configured, record only usage events and never the processed value.
What should I check before using the Regex Tester result?
Nested repetition patterns and oversized inputs are blocked because catastrophic backtracking can freeze a browser. Test against representative edge cases before deployment. Review the final output in the application or workflow where you plan to use it.