Regex Tester

Test and debug regular expressions in real-time.

Developer tool

Regex Tester

Try regular expressions against sample text.

Pattern

Flags

Matches

alpha@example.com @ 8 beta@test.dev @ 30

Test text

Overview

What is Regex Tester?

A Regular Expression (Regex) is a sequence of characters that specifies a search pattern. They are incredibly powerful for string searching, parsing, and data validation, but notoriously difficult to write and debug. Our Regex Tester provides instant visual feedback, highlighting all pattern matches within your target text as you type.

Use cases

When to use Regex Tester?

Writing input validation rules for emails, passwords, or phone numbers

Extracting specific data points from large log files

Debugging complex search-and-replace patterns before deploying them to code

Learning and practicing regex syntax

Learn the concept

Guides for Regex Tester

Regex Explained for Developers Who Need Practical Patterns

A practical introduction to regular expressions, how matching works, and how to debug patterns without guessing.

Common Regex Patterns You Will Reuse Constantly

A quick reference for common regex patterns, what they do, and what to watch out for before copying them into production.