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regex101: build, test, and debug regex
Build, test, and debug regular expressions online with instant feedback, syntax highlighting, and helpful explanations for multiple programming languages.
Test and debug regex instantly online
regex101 is an online tool designed to help you build, test, and debug regular expressions easily. Whether you're new to regex or an experienced developer, you can write patterns, see real-time matches, and get detailed explanations for each part of your regex.
The site supports multiple programming languages, including PHP, Python, JavaScript, Java, C#/.NET, Go, and Rust. You'll find syntax highlighting, quick references, and a community-driven library of patterns to learn from. There's also a regex quiz and helpful cheat sheets to boost your skills.
If you're looking to experiment with regular expressions or troubleshoot your patterns, regex101 offers an intuitive interface and instant feedback, making it a go-to resource for anyone working with regex.
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