This vim-like trigger lets you type "t" digit whatever "!" and then will type that string that many times.
For example, type "t3Hello !" and get "Hello Hello Hello "
Note that you could use \d\d? if you wanted to allow up to 99 times, or even \d+ if you wanted no limit. But be mindful that it might be difficult to stop your macro if you mistype (remember that Command-Control-Shift-Option clicking on the status menu will cancel all macros).