Test JavaScript regular expressions live
Enter a pattern to see matches.
| . | Any character except newline |
| \d \w \s | Digit, word character, whitespace (uppercase negates) |
| ^ $ | Start / end of input (or line with m) |
| * + ? | Zero or more, one or more, optional |
| {n,m} | Between n and m repetitions |
| (abc) | Capturing group |
| (?<name>abc) | Named capturing group |
| (?:abc) | Non-capturing group |
| a|b | Alternation |
| [a-z] | Character class |
| (?=x) (?!x) | Lookahead / negative lookahead |
| (?<=x) (?<!x) | Lookbehind / negative lookbehind |
| \b | Word boundary |
| *? +? | Lazy quantifiers |
The tester runs your pattern with the browser's RegExp engine, so what works here works in your JavaScript and TypeScript code. Start from a common pattern, refine it while watching the highlights update, then copy the pattern and flags into your project.
JavaScript (ECMAScript) regular expressions, exactly as used by the RegExp class in browsers and Node.js, including named groups, lookbehind and Unicode mode.