Write and test regular expressions against sample text. View match counts, highlight matched text, extract capture groups, and understand match coordinates instantly in your browser.
Workspace
Use the tool below. Your inputs stay local when the tool supports browser-only processing.
| Match | Index | Length | Captures |
|---|---|---|---|
| No matches found. | |||
Workflow
Type or paste your regex pattern into the pattern field, including any flags like global or case-insensitive. If you are used to a regex tester workflow, you will find the same instant feedback loop here — test your pattern against sample data without setting up a local environment.
Paste one or more sample strings into the test input area that you want to match against your pattern. Like any good regex tester, the tool highlights every match in real time, showing you exactly which portions of your text the regular expression captures.
Examine the highlighted matches and the detailed match info panel to understand capture groups and positions. Iterate on your pattern by editing it directly and watching the results update instantly — just like a dedicated regex tester, this rapid feedback loop helps you get your expression exactly right.
When you use this regex tester, you get immediate visual feedback on every match, capture group, and replacement operation without running your entire application. It mimics the behavior of a regex tester library call but with a visual interface that shows you exactly what each part of your expression does.
Yes — while this regex tester is designed with common regex syntax in mind, it supports common regex flavors including PCRE-compatible patterns, JavaScript regular expressions, and Python-style expressions. You can test patterns for any language and then adapt the final expression to your specific runtime syntax.