Test a regex against real text.
Enter a regular expression, provide sample text, and inspect the resulting matches while building or debugging a pattern.
See what matches
Test a pattern against your sample input and quickly see whether it behaves as expected.
Iterate quickly
Change the expression or test data while refining patterns for validation, extraction, search, or text processing.
Test sensitive data locally
Your patterns and test strings stay on your device.
From pattern to matches
Enter a pattern, paste test text, and see exactly what the expression matches.
\b[\w.%+-]+@[\w.-]+\.[A-Za-z]{2,}\b
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When a Regex Tester is useful
Input validation
Test patterns used for emails, identifiers, filenames, URLs, codes, or other structured input.
Extracting data
Check expressions designed to find particular values inside logs, responses, documents, or application text.
Debugging existing regex
Paste a pattern from your codebase and test it against smaller examples before changing application code.
Test production-like data without uploading it.
Regex debugging often involves logs, application output, customer-generated text, internal identifiers, and other data you may not want to send to a third-party website. DevT Pro lets you test patterns locally.