grepWin is described as 'simple search and replace tool which can use PCRE regular expressions to search for strings of text within files. grepWin adds an entry to the shell context menu to easily search selected folders' and is a popular File Search utility in the file management category. There are more than 25 alternatives to grepWin for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and BSD. The best alternative is DocFetcher, which is both free and Open Source. Other great apps like grepWin are grep, dnGREP, AstroGrep and The Silver Searcher.
DocFetcher is a portable German/English open source desktop search application. It allows you search the contents of documents on your computer. - You can think of it as Google for your local document repository.
AstroGrep is A Microsoft Windows GUI File Searching (grep) utility. Features include regular expressions, versatile printing options, stores most recent used paths and has a "context" feature which is very nice for looking at source code.
regexxer is a nifty GUI search/replace tool featuring Perl-style regular expressions. If you need project-wide substitution and you’re tired of hacking sed command lines together, then you should definitely give it a try.
Quickly search through large numbers of files on your PC or network using powerful text patterns to find exactly the information you want. Search and replace with plain text or regular expressions to maintain web sites, source code, reports, ...
Search and Replace for Windows is a fast, easy to use grep utility for search and replace in multiple files, directories and archives. Supports grep style Regular Expressions. Script language for webmasters and programmers.