What are some alternatives?
When comparing grep and dnGREP, you can also consider the following products
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, ...
AstroGrep - AstroGrep is A Microsoft Windows GUI File Searching (grep) utility.
grepWin - grepWin is a simple search and replace tool which can use PCRE regular expressions to search for...
ripgrep - ripgrep combines the usability of The Silver Searcher with the raw speed of grep.
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