dnGREP is described as 'DnGrep allows you to search across files with easy-to-read results. Search through text files, Word documents, PDFs, and archives using text, regular expression, XPath, and phonetic queries. dnGrep includes search-and-replace, whole-file preview, right-click search in File' and is a File Search utility in the file management category. There are more than 50 alternatives to dnGREP for a variety of platforms, including Windows, Linux, Mac, BSD and Microsoft Outlook apps. The best dnGREP alternative is DocFetcher, which is both free and Open Source. Other great apps like dnGREP are grepWin, Clapgrep, ripgrep and SearchMyFiles.
Is not a Find/Replace tool