Notepad++ Regex Search and Replace

Use regular expressions in Notepad++ to find patterns, preview matches and make controlled replacements.

When to use this feature

Regular expressions are useful for repeated patterns such as whitespace, IDs and log timestamps.

Step-by-step instructions for Windows users

1. Open Notepad++ on Windows 10 or Windows 11 and save a backup of the file you plan to edit.
2. Use Search > Replace, set Search Mode to Regular expression, test Find Next first, then replace a small selection before using Replace All.
3. For example, `\b[A-Z]{2}\d{4}\b` matches two uppercase letters followed by four digits. Escape literal dots with `\.`.
4. Review the result and save a separate copy before replacing the original file.

Important details and compatibility

For example, `\b[A-Z]{2}\d{4}\b` matches two uppercase letters followed by four digits. Escape literal dots with `\.`.

Menu labels can differ between versions, and plugins may require a compatible build. Check the application settings on your own PC rather than assuming all installations have the same options.

Common mistakes and safety

Test on a copy of the file. Regex can match more than intended, especially with `.*` and multiline options.

If the result differs from what you expected, undo the change, reopen the original copy, and repeat the steps with a smaller sample.

Frequently asked question

What is regex mode in Notepad++?

It treats the search field as a pattern instead of literal text.

Does this work in the US and Canada?

These Windows editing features are not region-restricted. The instructions use American English menu terminology and apply to supported Windows PCs in the United States and Canada.

Related Notepad++ resources

See the download guide, Windows 11 instructions, FAQ, and all tutorials.

Editorial team · Published 2026-10-20 · Updated 2026-10-20. This is an instructional guide, not a claim of hands-on testing on every Windows build.