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Regex Tester
Text Engine
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Regex Tester & Expression Debugger

Test, evaluate, and debug regular expressions online with live match highlighting, capture groups, regex flags, and syntax explanation.

Live regex pattern matching
Flag controls (g, i, m, s)
Capture groups breakdown
100% private in-browser evaluation
Step-by-Step Guide

How to Use Regex Tester Online

Follow these quick steps to process your data online directly in your browser with zero latency and 100% privacy.

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Step 1Compiles regular expression with selected flags.
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Step 2Executes pattern against source text.
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Step 3Outputs match indices, matched text substrings, and captured sub-groups.
Demonstration

Example Input & Output

Source Text to Test Against
Contact support at dataformattools@gmail.com or hello@example.com for inquiries.
Applications

Common Use Cases

Pattern Validation

Test email, URL, phone number, and data extraction regexes against sample text.

Knowledge

Frequently Asked Questions

How do I test a regular expression?

Enter your regex pattern and flags at the top, then paste your test text below to inspect live matches.

Workflow

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