RegEx Tester
About this Tool
Test and validate regular expressions with real-time pattern matching
How it works
This tool runs entirely in your browser using JavaScript. No data is sent to our servers, ensuring your privacy and security. It's designed to be fast and responsive, working even when you're offline.
Share this tool
Related Tools
Fake BD Smart NID Card Maker
Generate sample BD smart NID cards for design purposes
Color Converter – HEX to RGB, HSL, CMYK Online Tool
Convert HEX to RGB, HSL, and CMYK instantly with our free Color Converter tool. Fast, accurate, and easy to use online.
XLS Viewer
View and browse Excel spreadsheet files
Shorthand to longhand converter online free
Convert shorthand words, abbreviations, stenography, and chat short forms into readable longhand text instantly with our free Shorthand to Longhand Converter online tool. Fast, accurate, and easy to use on any device.
Regex Tester Online - MasterTooly
MasterTooly Regex Tester is an online tool that allows you to test, validate, and debug regular expressions in real time. It provides instant feedback so developers and learners can easily understand how regex patterns work.
Live Regex Testing
Enter your regex pattern and test string to instantly see matching results. The tool automatically highlights matches as you type, making it easier to debug and refine expressions.
Supported Regex Flags
- g (global) - Finds all matches in the text
- i (ignore case) - Case-insensitive matching
- m (multiline) - Enables multiline matching
Features
- Real-time regex testing
- Instant match highlighting
- Error detection for invalid patterns
- Copy regex pattern and results
- Simple and clean interface
How to Use
- Enter your regex pattern in the input field
- Paste your test string in the text area
- Enable required flags if needed
- View matched results instantly
Use Cases
- Form validation (email, password, phone)
- Data extraction from text
- Search and replace testing
- Learning and practicing regex
- Debugging regular expressions in development
Why MasterTooly Regex Tester
This tool helps developers and beginners understand regular expressions visually and efficiently. It reduces debugging time and improves accuracy when working with complex string patterns.
Frequently Asked Questions
What is a Regex Tester?
A Regex Tester is an online tool that helps you test and debug regular expressions in real time by matching patterns against text.
How does MasterTooly Regex Tester work?
You enter a regex pattern and a test string, then the tool instantly highlights all matches and shows results in real time.
What are regex flags?
Regex flags modify how the pattern works. For example, g finds all matches, i ignores case, and m enables multiline matching.
Is this tool free to use?
Yes, MasterTooly Regex Tester is completely free and works directly in your browser.
Can I copy regex results?
Yes, you can copy both the regex pattern and matches with a single click.