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grepWin is a Windows utility for searching and replacing text across files with regular expressions. Its maintainer currently lists Windows 10 version 22H2 or later as the minimum requirement. You can narrow a search by folder, file type, or file size, save common expressions as presets, and inspect matching files in the results list before deciding whether to replace anything.
What grepWin does
grepWin searches files for text patterns and can replace matches. Regular expressions (regex) let you describe a pattern rather than search only for one exact string—for example, a pattern can match several variations of a word or a repeated format. The official description calls it “Regular expression search and replace for Windows.” Stefan’s Tools: grepWin and the grepWin GitHub repository provide the product details and project links.
Windows requirement and licensing
The maintainer’s page, whose footer was current on September 1, 2026, lists Windows 10 22H2 or later as the minimum requirement. Claims on older third-party pages that it supports Windows 7 or 8 do not match that current developer statement; check the official page for any later changes before installing. The maintainer identifies grepWin as GPL-licensed and links to its source code on GitHub.
How to search and replace safely
Use a staged workflow: define the scope, check the pattern with a search, inspect the matches, and then make a replacement only when the results are what you intended. The official pages describe search results in a list at the bottom of the dialog, but do not establish a dedicated preview mode, automatic backups, or an undo guarantee. Keep your own backup of important files before changing them.
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- Choose the folder. Start grepWin from the folder you want to search. The utility can be added to the Windows shell context menu, which lets you start a search from a selected folder.
- Limit the files. Use the available file-type and file-size filters to narrow the search to relevant files rather than scanning an unnecessarily broad set.
- Set up the search. Enter the text or regular expression you want grepWin to find. If regex is unfamiliar, follow the short tutorial linked from the maintainer’s grepWin page before using a pattern on important files.
- Run the search and inspect results. Review the matches in the results list at the bottom of the dialog. Check that the files and text shown are the intended targets before proceeding.
- Replace only after checking. Enter the replacement and apply it only after confirming the search results. Back up important files first; do not assume grepWin will automatically preserve a recoverable copy.
Reuse regular expressions with presets
If you run the same kinds of searches repeatedly, grepWin lets you save common expressions as presets and retrieve them later. Presets reduce re-entry, but they do not guarantee a pattern is appropriate for every folder or file set. Confirm the selected folder, filters, and results each time before replacing text.
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Where to find tutorials and technical help
- Regex basics: The maintainer page links to a short regex tutorial for learning how patterns work.
- Command-line use: The project provides separate parameter documentation for running grepWin with command-line options, useful when you need to automate or repeat searches.
- Visual Studio: The maintainer documents Visual Studio integration for users working in that development environment.
- Source and project information: Visit the official GitHub repository or the Stefan’s Tools page, which links to these resources.
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