Regex Visualizer
Paste a regex and see the token tree (literals, classes, groups, quantifiers) in ASCII — helps understand complex expressions. Everything in your browser.
Visualise a regex's structure
A complex regular expression, full of nested groups and quantifiers, is hard to read even for whoever wrote it. This tool opens the regex into an ASCII token tree and reveals the structure hiding behind that dense line of symbols.
The elements get separated out (literals, character classes, groups, quantifiers) and arranged in a hierarchy, making it clear what sits inside what and how the pieces fit together. It helps a lot when you inherit someone else's regex, need to debug a pattern that won't match, or just want to learn how more elaborate expressions work.
The analysis happens in your browser and nothing gets sent anywhere. Paste the expression, see the tree right away, and turn a cryptic line into something readable.
Related Tools
Regex Cheatsheet
Quick reference of the main regular expressions — quantifiers, classes, anchors, groups, lookarounds, flags. With clickable examples and explanations. Everything in your browser.
Regex Tester
Test regular expressions in real time. See highlighted matches and captured groups.
CSV Validator & Viewer
Validate, parse and visualize CSV data in table format. Automatically detects delimiters (comma, semicolon or tab) and highlights formatting errors.