Regex Tester
Test and debug your regular expressions in real-time
Regex Pattern
Define what you want to find
Your Text
Paste the text you want to search through
Results
Found matches will appear here
Regex Cheat Sheet
A quick guide for common regex symbols
.Any char except newline\dDigit (0-9)\wWord char (a-z, A-Z, 0-9, _)\sWhitespace\DNon-digit\WNon-word char\SNon-whitespace[abc]Any of a, b, or c[^abc]Not a, b, or c*0 or more+1 or more?0 or 1^Start of string$End of string()Capturing group|OR operatorOptions
Workspace
What is Regex Tester Online - Simple Regular Expression Debugger?
Our Regex Tester is a simple but powerful tool that helps you write, test, and debug regular expressions in real-time. Whether you're a developer or just learning regex, our tool provides clear feedback, highlights matches instantly, and breaks down complex capture groups for you. Everything stays private because all testing happens right in your browser.
Key Features & Benefits
Real-Time Feedback
See your matches update instantly as you type your pattern or change your test text.
Common Templates
Access a library of prebuilt regex patterns for emails, URLs, IP addresses, and more to save time.
Built-in Cheat Sheet
Quickly look up common regex symbols and what they do without leaving the page.
Private & Secure
Your patterns and data never leave your device. All regex testing happens entirely within your browser for total privacy.
How to Use the Regex Tester Online - Simple Regular Expression Debugger
Enter Your Pattern
Start by typing your regular expression in the pattern box. If you're stuck, choose one of our common templates to get started.
Paste Your Text
Enter the text you want to search through in the test area. Our tool will immediately highlight any matches it finds.
Refine with Flags
Use the sidebar options to toggle case sensitivity, global search, and multiline mode to get the exact results you need.
Analyze Results
Check the results panel to see each match, its position, and any capture groups. You can then copy your matches or download the results.
Practical Use Cases
Validating Input
Test patterns for email validation, password requirements, or any other user input before adding them to your code.
Data Extraction
Build patterns to quickly find and pull specific data from unformatted text or log files.
Learning Regex
A secure sandbox to experiment with regular expressions and see exactly how different symbols affect your search.
Search & Replace
Perfect your matching patterns before using them in your code editor or database scripts.