Firstly, that startup idea was an overt irony aimed at Google :). Secondly, my guess would be that maybe 0.001% of gmail users are familiar with command line in

Firstly, that startup idea was an overt irony aimed at Google :). Secondly, my guess would be that maybe 0.001% of gmail users are familiar with command line interface and regular expressions. Not everybody is a coder and that is not necessarily bad.