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Regex Tester & Debugger

Interactive RegExp editor supporting global, case-insensitive, and multiline flags with match indices and matched group displays.

How to use Regex Tester & Debugger step by step

1. Paste your input into the Regex Tester & Debugger editor.
2. Configure the options for encoding, formatting or validation.
3. Run the tool and read the output or any errors it reports.
4. Copy the result back into your editor.

Why use this developer tools tool

• Regex Tester & Debugger runs entirely inside your browser, so your file is never uploaded and nothing is logged.
• Regex Tester & Debugger is one of 570 tools in Developer Tools, next to JSON Formatter & Validator when the related job needs doing too.

Frequently asked questions

Is Regex Tester & Debugger free to use?

Yes. Regex Tester & Debugger has no usage limit, no sign-up and no paywall.

Can I use Regex Tester & Debugger on a phone?

Yes. KPM Tools is built to work on a phone as well as a desktop, so you can run Regex Tester & Debugger without installing anything.

What is Regex Tester & Debugger used for?

Regex Tester & Debugger covers regex tester, regular expression tester and test regex online.

Related searches

• regex tester
• regular expression tester
• test regex online
• regex matcher

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Step-by-step guide

Read How to Test and Debug Regex Patterns Live for a detailed walkthrough, written for the tool page you are on.