Comparison & Text
Test JavaScript-compatible patterns and inspect matches.
Common examples
Sample patterns are educational and may not validate every real-world case.
| # | Index | Match | Groups | Named groups |
|---|---|---|---|---|
| 1 | 0 | API | API | word: API |
| 2 | 8 | HTTP | HTTP | word: HTTP |
[API] and [HTTP] are common terms.
Common examples
Sample patterns are educational and may not validate every real-world case.
Enter a JavaScript-compatible pattern, select flags, and inspect matches, groups, highlighting, and replacement output in real time.
Safely test JavaScript regular expressions, flags, capture groups, named groups, zero-length matches, and replacements without raw HTML rendering.