Prolcons, the command /noop can apply to other uses as well, not just regex. Here are two examples I hereby demonstrate:

//noop $$?"Enter Anything:" | echo -a $!

//noop $tip('Tray Tip', $me says: $+ ,test!,5)

The first one acts like a popup dialog where you enter anything to have it echoed. The seconds is a balloon tip, where it pops up on your right hand corner of your PC task bar. Again, there are other scenarios /noop can be used in conjunction with other identifiers...

In older mirc versions, /noop functions the same as that of /echo -q