Regex Tester
Test and debug regular expression patterns in real-time. View highlighted matches, capture groups, and match counts with support for global, case-insensitive, and multiline flags.
Regex Tester
Test regular expression patterns in real-time with highlighted matches
Matches
Capture Groups & Details
Regex Quick Reference
. Any char\d Digit [0-9]\w Word char\s Whitespace* 0 or more+ 1 or more? 0 or 1{n} Exactly n^ Start$ End[abc] Set(x) GroupAbout Regular Expressions
Regular expressions (regex) are patterns used to match character combinations in strings. They're a powerful tool for text processing, validation, search and replace, and data extraction in virtually every programming language.
Validation
Validate emails, phone numbers, SSNs, and custom formats
Extraction
Extract specific patterns from text using capture groups
Search & Replace
Find and replace text using regex patterns in editors and scripts
Free online Regex Tester. Test regular expression patterns instantly with real-time highlighting, capture group display, and match counting. Supports global (g), case-insensitive (i), and multiline (m) flags. Includes a quick reference guide for common regex patterns. Perfect for developers, data analysts, and anyone working with text pattern matching.
Save Configuration Snapshot
Save current parameters to your dashboard for instant one-click reloading.
About This Calculator & Guide
About the Regex Tester - Test Regular Expression Patterns Online Calculator
The Regex Tester - Test Regular Expression Patterns Online Calculator is a specialized online utility designed to help you free online regex tester. test regular expression patterns in real-time with highlighted matches, capture group details, and support for global, case-insensitive, and multiline flags. It performs calculations in real-time to provide immediate, reliable estimates for study, work, or daily tasks.
How to Use
Simply enter your parameters in the input fields of the calculator widget above. The tool evaluates the inputs instantly and displays the results in real-time. You can modify any value to check alternate scenarios and compare figures dynamically.
Data Privacy & Safety
All calculations are executed locally within your web browser. No inputs are sent to our servers or stored externally, ensuring your personal and financial details remain completely private and secure.
FAQ
Frequently Asked Questions
What does the Regex Tester - Test Regular Expression Patterns Online do?+
Free online regex tester. Test regular expression patterns in real-time with highlighted matches, capture group details, and support for global, case-insensitive, and multiline flags. It is designed for quick everyday use and gives clear results without requiring a sign in.
Is the Regex Tester - Test Regular Expression Patterns Online free to use?+
Yes. The Regex Tester - Test Regular Expression Patterns Online is free to use online and works directly in your browser.
Can I use the Regex Tester - Test Regular Expression Patterns Online on mobile?+
Yes. The calculator layout is responsive, so you can use it on phones, tablets, laptops, and desktop screens.