regex - Number of occurrences of substring in string in Swift

Question

My main string is "hello Swift Swift and Swift" and substring is Swift. I need to get the number of times the substring "Swift" occurs in the mentioned string.

This code can determine whether the pattern exists.

var string = "hello Swift Swift and Swift"

if string.rangeOfString("Swift") != nil {
    println("exists")
}

Now I need to know the number of occurrence.

Answer 1

A simple approach would be to split on "Swift", and subtract 1 from the number of parts:

let s = "hello Swift Swift and Swift"
let tok =  s.components(separatedBy:"Swift")
print(tok.count-1)

This code prints 3.

Edit: Before Swift 3 syntax the code looked like this:

let tok =  s.componentsSeparatedByString("Swift")