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Regex Tester & Debugger
Test and debug regular expressions in real time with match highlighting and substitution previews.
Regex Tester & Debugger Workspace
This tool runs directly in your browser using local CPU execution. Enter your input below to process.
About Regex Tester & Debugger
Verify your regular expression patterns against test strings before using them in production code.
How to Use Regex Tester & Debugger
- 1Enter your regular expression pattern.
- 2Toggle flags like g (global), i (case insensitive), and m (multiline).
- 3View highlighted matches in the test text.
When to Use This Tool
- •Writing form validation rules.
- •Extracting data from log files.
- •Debugging complex regex patterns.
What to Expect from the Result
Real-time match highlights and match group extractions.
Your Privacy is Guaranteed (100% Client-Side)
Regex evaluation happens inside your browser JavaScript engine. No strings are logged or uploaded.
Frequently Asked Questions
Which regex dialect is supported?
Standard ECMAScript (JavaScript) regular expressions.
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