About this tool: Regular Expression Tester
Test JavaScript regular expressions. Match indices start at zero; processing stops after 1,000 matches.
The tester uses JavaScript regular-expression syntax and returns each match with its zero-based UTF-16 index and capture groups. Flags control repeated matching, case sensitivity and multiline behavior. Expressions run in a separate worker and are stopped if they take too long.
How the calculation works
Worked example
| Pattern | \b[A-Za-z]+\b |
| Flags (g, i, m, s, u, y) | g |
| Input | Hello, Asted Cloud! |
Hello (0); Asted (7); Cloud (13)
Questions and answers
What does this tool do?
Test JavaScript regular expressions. Match indices start at zero; processing stops after 1,000 matches. The tester uses JavaScript regular-expression syntax and returns each match with its zero-based UTF-16 index and capture groups. Flags control repeated matching, case sensitivity and multiline behavior. Expressions run in a separate worker and are stopped if they take too long.
What affects precision and input format?
Text operations depend on the selected format. Check the supported characters and syntax in the description and example.
Where are the calculations performed?
The calculation runs in your browser. You can use the tool without installing software.
Asted Cloud
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