# Testing Regex Before Shipping It


How to test matching and replacement patterns before using regex in real code or shell commands.

This guide is the canonical guide page for related tools on ilham.dev. It should grow into practical explanations, caveats, examples, and references instead of creating one thin article per utility.

## Related tools

- [Regex Cheatsheet](/tools/regex-cheatsheet/) — A quick reference of regular-expression syntax.
- [Regex Replace Tester](/tools/regex-replace-tester/) — Preview regex find-and-replace results with capture group references and live highlighting.
- [Regex Tester](/tools/regex-tester/) — Test a regular expression against sample text with live matches.

## Notes for future edits

- Keep the guide reusable and factual.
- Link to personal posts only when there is a real incident, measurement, migration, or lesson.
- For sensitive inputs, mention whether the related tool runs locally in the browser and warn against pasting production secrets without understanding the trust boundary.