Free online regex flags tester — compare how different regex flags (g, i, m, s, u, y) affect pattern matching instantly in your browser. No data is stored. Shows match counts side-by-side for each flag combination.
Regex pattern
Free online regex flags tester — compare how different regex flags (g, i, m, s, u, y) affect pattern matching instantly in your browser. No data is stored. Shows match counts side-by-side for each flag combination.
Runs entirely in your browser. No data is sent to our servers.
Compare how different flags affect matching of mixed-case text
Regex Tester
Free online regex tester — test regular expressions with live match highlighting and position tracking instantly in your browser. No data is stored. Shows match positions and visual highlighting of matched text.
Regex Explainer
Free online regex explainer — break down any regular expression into plain English descriptions instantly in your browser. No data is stored. Explains character classes, quantifiers, groups, anchors, and lookaheads.
Regex Replace
Free online regex find and replace — search text with regular expressions and replace matches with custom patterns instantly in your browser. No data is stored. Supports capture group references ($1, $2) in replacement strings.
Regex Split
Free online regex text splitter — split text into parts using regular expression delimiters instantly in your browser. No data is stored. Supports custom flags and configurable result limits.