What are some alternatives?
When comparing dnGREP and grepWin, you can also consider the following products
grep - grep is a command-line utility for searching plain-text data sets for lines matching a regular...
AstroGrep - AstroGrep is A Microsoft Windows GUI File Searching (grep) utility.
PowerGREP - 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, ...
Agent Ransack - Agent Ransack is a tool for finding files and information on your hard drive fast and efficiently.
TextCrawler - Find and replace across multiple files
DocFetcher - DocFetcher is a portable German/English open source desktop search application.