Regex Tester
Regex Pattern
Drop file to load
Processed locally in browser
What is the Regex Tester?
The Regex Tester is a free developer tool designed to help you write, evaluate, and debug Regular Expressions interactively. By instantly highlighting matches within a body of text, you can see exactly how your regex pattern performs.
Why test offline?
Developers frequently use regex to parse sensitive data like email addresses, phone numbers, or credit card formats. Pasting this data into an online regex tester sends it to a third-party server. Status202’s Regex Tester executes everything locally within your browser, ensuring absolute privacy for your test cases and proprietary algorithms.
How to use this tool
- Enter your regular expression pattern in the left input box (e.g.,
[a-z]+). - Paste your test string in the right output/test box.
- The tool will execute the regex and display matches or errors in the output panel.
Frequently Asked Questions
Is my test data kept private?▼
Yes. Testing regex often involves pasting sensitive production data (like emails, IPs, or IDs) to see if a pattern matches. Our tool evaluates the regex entirely in your browser using JavaScript's native RegExp engine, so your test strings are never uploaded.
What regex flavor is supported?▼
This tool uses the standard JavaScript (ECMAScript) RegExp engine natively built into your browser.
Why is Regex testing important?▼
Regular expressions can be complex and hard to read. Testing them interactively ensures they match exactly what you want and helps prevent catastrophic backtracking errors in production.