Regular Expression Tester
Test regex patterns against sample strings with instant group match highlighting
Flag g performs a global search across all matches; i ignores letter case; m treats beginning and end characters (^ and $) across multiple lines.
Yes, modern browser engines fully support positive and negative lookaheads (?= and ?!) and lookbehinds (?<= and ?
No, regex evaluation runs completely inside your local browser JavaScript engine with zero external network transmission.
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Test regular expressions
g
i
m
s
