Free Online Regex Tester & Debugger
Test your JavaScript regular expressions in real-time. Highlights matches and validates syntax. Browser-based and secure.
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Match Results (0)
No matches found (or invalid pattern).
Frequently Asked Questions
What flavor of Regex is this?
This tool uses JavaScript's regular expression engine, which is compliant with the ECMAScript standard.
What do the flags do?
`g` (global) finds all matches, `i` (case-insensitive) ignores case, and `m` (multiline) treats start/end anchors per line.
Is this tool secure?
Yes, your regex and test strings are processed entirely in your browser using JavaScript. Nothing is sent to a server.