Which regex engine does this use?

Our regex tester uses your browser's native JavaScript RegExp engine. It accurately reflects how your patterns will behave in JS environments.

What do the global (/g) and multiline (/m) flags do?

The global flag finds all matches in the string rather than stopping at the first. The multiline flag changes the behavior of ^ and $ to match the start/end of each line, not just the entire string.

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Tools/Regex Tester

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Regex Tester

Test regular expressions in real-time with syntax highlighting.

Regular Expression

//gi

/g (Global)

/i (Case Insensitive)

/m (Multiline)

Test String

Match Result

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Real-time Regular Expression Tester

Build, test, and debug your regular expressions in real-time. Our Regex Tester highlights matches instantly as you type against your test string.

Easily toggle `/g` (global), `/i` (case-insensitive), and `/m` (multiline) flags to see how they affect your capture groups.

Read full article about Regex Tester

Frequently Asked Questions

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