Added in 1.9.6
Haltable using ^
<level> - The User Access Level for the event to trigger.
<matchtext> - The Matchtext to listen to.
<*#?=!@> - The Matchtarget to listen to.
<commands> - The commands to be performed when the event listener's criteria is met.
on *:CLIENTTEXT:*:*:echo -ag the client text was $1-