Specifically, I'm looking at the following features:
var/string1 = "Hello world!"
//slice from 7th character (inclusive) to 12th character (exclusive)
var/string2 = string1[7..12]
usr << string2 //"world"
var/string3 = "I am the very model of a modern major general!"
string3[46] = "."
usr << string3 //as above, but exclamation point is now a period