Shipwright Studio · Lab
Regex Tester is a free online tool that tests regular expressions live. Type a pattern and see every match highlighted in your test string, inspect capture groups match by match, and consult the built-in cheatsheet — all in the browser, nothing to install.
\d digit 0–9\w word char\s whitespace. any char (exc. newline)* 0 or more+ 1 or more? 0 or 1{n,m} between n and m[abc] char class[^abc] negated class(x) capture group(?:x) non-capturing(?<n>x) named groupx|y alternation^ start of line/string$ end of line/string\b word boundary(?=x) lookahead\d digit\w word char\s whitespace. any char* 0 or more+ 1 or more? 0 or 1{n,m} n to m[abc] char class(x) groupx|y alternation^ $ anchors\b word boundary(?=x) lookahead