Regex Tester & Regular Expression Validator

6 MATCHES
//
Test String
Hello World! This is a Test string for Regex. React is awesome.

How to Use the Regex Tester Regular Expression Validator Tool

Test and debug regular expressions in real time. Visualize matches with color highlights, use flags, and reference the cheat sheet. Free, private, offline.

  1. 1

    Type or paste the text you want to search through in the large "Test String" area at the bottom.

  2. 2

    Enter your regular expression in the top input box (between the slashes).

  3. 3

    Toggle the g, i, or m flags in the sidebar and watch the yellow highlights update instantly.

Why Choose Our Regex Tester Regular Expression Validator?

Real-Time Visualization

As you type your expression, matching substrings in your test text are instantly highlighted in bright yellow so you can debug visually.

Global Flags (g, i, m)

Easily toggle Global (find all), Case-Insensitive (ignore casing), and Multi-line flags with a single click to alter how your pattern executes.

Interactive Cheatsheet

Forgot the syntax for a word boundary or a negative lookahead? Click any item in the sidebar cheatsheet to instantly insert it into your pattern.

Client-Side Execution

Your regular expressions and test strings are evaluated locally using your browser's native JavaScript RegExp engine for maximum privacy and zero latency.

Frequently Asked Questions