Build, test, and debug regular expressions
Matches lines containing a forward slash followed by the literal text ' in ', capturing three groups: the segment before the slash, the segment between the slash and ' in ', and everything after ' in '. With the gm flags, it processes every line in multiline input and finds all occurrences. It's useful for parsing strings like 'path/to/file in directory', 'artist/title in album', or log entries following an 'X/Y in Z' structure.