JSON Validator & Formatter

Why Use Regex Tester?

Regex Tester helps you build, test, and debug regular expressions in real time. It instantly highlights matches, shows captured groups, and explains how each part of your regex works, making it ideal for developers, testers, and learners.

Key Features

• Real-time regex matching and validation
• Match count with detailed group information
• Support for common regex flags (g, i, m)
• Clear explanation of regex patterns (Python-style)
• Test multiple inputs at once
• Copy regex with flags in one click
• Dark mode support
• Runs entirely in your browser (no data uploaded)

How to Use Regex Tester

1. Enter your regular expression in the regex input box.
2. Select required flags such as g, i, or m.
3. Paste the text you want to test in the Test String area.
4. View matched results and captured groups instantly.
5. Read the explanation to understand how the regex works.
6. Copy the regex for use in your code.

Learn Regular Expressions

If you are new to regular expressions or want to master advanced patterns, the following resources can help you learn and practice regex effectively:

• Python Regex Documentation (Official)
• MDN – Regular Expressions Guide
• Regular-Expressions.info (Beginner to Advanced)
• RegexOne – Interactive Regex Tutorials

Frequently Asked Questions