Regex Tester & Explainer
Test a pattern, see every match, and get a plain-English breakdown token by token.
Paste a pattern and a test string. We highlight every match, list capture groups, and explain the pattern in plain English so future-you (and your reviewer) can read it.
No matches yet.
Runs entirely in your browser — nothing you enter is sent to a server.
Need this for real, on your stack?
These free tools are a taste of how we think. We’re a senior software team across Romania & Pakistan that ships deep technical work — platforms, infra, data and the gnarly bits in between.
Talk to our engineers →Flavour
JavaScript regex engine — same one your browser and Node use. Most patterns port cleanly to Python and PCRE; lookbehind support is universal in modern engines.
Pro tip
If the explanation is hard to read, the regex probably is too. Anchor it (^/$), name your groups ((?<email>…)), and add a comment.
Built by WeWorkWorldwide — a senior software team in Romania & Pakistan that ships deep technical work. Need this turned into something production-grade for your stack? Talk to our engineers →