Regex Visualizer
Breaks a regular expression into its parts and explains each one in plain English
Regular expressions are short and powerful, but they can look like gibberish the first time you see one. This tool takes any pattern you paste in and splits it into its building blocks — capture groups, character classes, quantifiers, anchors, and more — then explains what each piece actually does, live as you type. Everything is parsed in your browser, so your pattern never leaves your machine. Whether it's an email validation regex or a pattern for parsing internal server logs, you can paste it in without worrying about where it goes.
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
How to use
- Type or paste the regular expression you want to analyze into the input box.
- Check the syntax tree below, where every token appears automatically in indented order.
- Read each entry's [type] label and description to understand what that symbol does.
- Tweak the pattern piece by piece and watch how group nesting (indentation) and quantifier interpretation change in real time.
FAQ
- Can I also test whether a string matches?
- No. This tool focuses on breaking down the structure of the expression itself, token by token, and does not include a separate match-testing feature for sample strings.
- Does it recognize advanced syntax like lookahead and lookbehind?
- Yes. Non-capturing groups (?:...), positive lookahead (?=...), negative lookahead (?!...), and lookbehind (?<=...) and (?<!...) are each broken out as their own entry with an explanation.
- Is my regex sent to an external server?
- No. Both the parsing and the explanations run entirely inside your browser, so even sensitive patterns stay private.