Regex Tester
Test regular expressions against sample text.
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What is Regex Tester?
A regex tester lets you develop and debug regular expressions with live matches — useful for log parsing, validation rules, and extractors.
How it works
Enter a pattern and sample text. PacketWizard shows matches and groups so you can iterate safely before deploying patterns.
Common issues
Catastrophic backtracking
Nested quantifiers on large inputs can freeze the tab. Simplify patterns and test on realistic sample sizes.
Frequently asked questions
Are patterns JavaScript-flavor?
Yes — PacketWizard uses the JavaScript RegExp engine. Syntax may differ slightly from .NET, PCRE, or Go RE2.
Related tools
Continue with these related PacketWizard tools for adjacent diagnostics.