Regex Tester

Build, test, and debug regular expressions online. Real-time highlighting and substitution.

🎓

New to Regex?

Master Regular Expressions with our 7-chapter interactive tutorial.

Regular Expression

/ / gi

Test String

Hello user@example.com, welcome to ToolArc!
Contact support@662048.xyz for help.
Invalid email: fake.email@domain

0 matches 0ms

Substitution

                        Result preview...
                    

How to Test Regular Expressions Online?

Enter Regex: Type your pattern in the top input box and toggle flags (g, i, m).
Enter Text: Paste the test string in the bottom textarea.
Realtime View: Matches are highlighted instantly as you type.
Substitution: (Optional) Use the substitution field to preview replacement results.

Privacy Note: Regex matching runs locally using your browser's JavaScript engine.

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