Regex Tester & Generator
Test, explain, generate, debug, visualize and optimize regular expressions instantly. A regex workspace with plain-English explainer, language code generator, debugger, complexity analyzer and 100+ ready-made patterns.
Quick Answer
Regex Studio is a free online regular expression tester, generator, explainer and debugger. Paste a regex pattern and test string to see live matches, plain-English explanations, step-by-step execution, complexity scoring and ready-to-paste code for Java, JavaScript, Python, C#, Go, PHP, Rust, Kotlin and Ruby — all running locally in your browser.
Live Regex Tester
Analysis
Human-readable, token-by-token explanation of your pattern.
Visual flow of the regex execution graph (anchors, classes, groups, quantifiers).
Token-by-token execution walkthrough against the first non-empty input line.
Pinpoints where matching failed and which character broke the match.
Suggestions to make your pattern shorter, faster and safer.
Sample strings generated from your pattern.
Matching examples
Non-matching examples
Plain-English description of what the regex matches.
Reverse Regex
—
Regex Generator
Describe what you want to match in plain English. The generator recognizes 50+ common intents (email, URL, phone, UUID, JWT, IPv4/IPv6, dates, hex color, credit card, ZIP, password rules, and more).
Matches a valid email address: local part with letters, digits and common symbols, followed by @, domain and a TLD of 2+ letters.
Language Code Generator
Idiomatic regex code for your pattern in 9 languages — copy and paste straight into your project.
Regex Pattern Library
0 patternsNamed Groups
Use (?<name>...) to capture into a named group. Generator below wraps your pattern.
Flags Playground
Toggle flags on the tester above and see how each one changes matching.
gGlobal — find all matches, not just the first.iIgnore case — A matches a.mMultiline — ^ and $ match line boundaries.sDotall — dot (.) also matches newline.uUnicode — full Unicode escapes and surrogate pairs.ySticky — match from lastIndex only.Interactive Cheat Sheet
Learning Mode
Challenges
Regex Interview Questions
Validation Rules
Drop-in validation snippets generated from your current pattern.
JSON Schema
A JSON Schema fragment using your pattern as a string constraint.
Saved Patterns
No saved patterns yet — hit the Save button in the tester to bookmark one.