Is there a way to check a string that was inputted by the user to see if it has a certain character or a certain word and do

Question

Certain commands based on if they typed did type that certain character or words?

Answer 1

You can use str.find(substring)
it will return string::npos if str doesn't contain substring. So you can do this:

if (str.find(substring) != string::npos) {
//Found. you do anything you want here
}

Answer 2

What is a npos, I'm sort of new to c++