1. Prepare
Enter a JavaScript expression and sample text. For example, \d+ on SO 4500; SO 4501 finds both numeric references.
Regex Tester
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Practical usage guide
Practical usage guide
A practical workflow for JavaScript Regex Tester
Test JavaScript regular expressions locally, inspect global matches and their indices, and copy results without sending text to a server.
2. Review
Review matches, groups and positions: 4500 starts at index 3 and 4501 at index 12. The tester applies global matching.
3. Apply
JavaScript RegExp can differ from Java or ABAP. Confirm flags, escaping and supported constructs in the engine that will run the expression.
Verification before operational use
- Use a representative case with the inputs needed to reproduce it.
- Confirm the result in the authorized target environment when runtime versions, namespaces, extensions, permissions or system configuration can change the outcome.
- Record the source, assumptions, tool settings and expected result so another reviewer can reproduce the check and distinguish verified facts from recommendations.
