What are some alternatives?
When comparing wingrep.com Windows Grep and grep, you can also consider the following products
grepWin - grepWin is a simple search and replace tool which can use PCRE regular expressions to search for...
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.
dnGREP - dnGrep allows you to search across files with easy-to-read results.
BareGrep - A free file finding and text searching tool: * Regular expression text search
ripgrep - ripgrep combines the usability of The Silver Searcher with the raw speed of grep.