Defined as a “Windows GUI grep utility,” AstroGrep is a search tool, similar to the “grep” tool in Linux, but with a Graphical User Interface (GUI, i.e. a window, not a command line). It’s faster and more reliable, in my experience, than the built-in Windows file search features. It can show search results in context within a file. Best of all, it lets you use Perl-compatible regular expressions. If you don’t know what a regular expression is, don’t worry about it; it’s still a handy tool. If you do, go celebrate, because this is wonderful.