Regex Tester & Explainer
Enter a regex and a test string, then click Test Regex to see matches highlighted.
How to Use the Regex Tester
- Select your preferred language
- Enter a regex pattern and optional flags
- Enter/paste a test string in the editor
- Click Test Regex
- Matched text will appear in green and unmatched in red
- View detailed explanation of your regex
💡 Pro Tip: Regex behaves slightly differently across languages. Use this tool for quick testing, but always confirm in your target language environment.
What is a Regex Tester?
A Regex Tester, or regular expression tester, is an online tool that allows you to test and debug regular expressions. You can enter a regex pattern and a test string, and the tool will highlight all the parts of the string that match the pattern, helping you to verify and refine your regex.
Why Use Our Regex Tester?
- Live Feedback: To see the results of your regular expression in real-time as you write it.
- Debugging: To quickly identify why a regular expression is not working as expected.
- Learning: To experiment with different regex patterns and understand how they work.
- Cross-Language Testing: To see how a regular expression will behave in different programming languages, such as JavaScript, Python, or Java.
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