Regex Tester
Quick Examples:
Available Flags:
g- Global (find all matches)i- Case insensitivem- Multilines- Dot matches newlineu- Unicode? Frequently Asked Questions
What does the Regex Tester do?
It lets you test regular expressions (regex) against sample text in real-time. It highlights matches, shows capture groups, provides match counts, and explains regex syntax. Perfect for developing and debugging patterns.
What regex flavor does this use?
The tester uses JavaScript regex flavor (ECMAScript). This includes features like lookaheads, character classes, and quantifiers standard to JavaScript.
Can it explain regex patterns?
Yes! Many regex testers break down patterns into plain English, explaining what each component does. For example, '\d{3}' is explained as 'match exactly 3 digits'. This helps learn and debug complex patterns.
Does it show capture groups?
Absolutely. The tester highlights each capture group (parentheses in regex) and shows what each group matched. This is crucial for extracting specific parts of text using patterns.
Can I test regex replacements?
Yes! Advanced testers include a replacement feature where you can test both the regex pattern and replacement string, seeing the output immediately. This is essential for search-and-replace operations.
Is my data safe and secure?
Yes, absolutely! This tool runs entirely in your browser. All data processing happens locally on your device - nothing is uploaded to our servers. Your files and data never leave your computer, ensuring complete privacy and security.