How to get substring with specific ranges in Swift 4?

You can search for substrings using range(of:).

import Foundationlet greeting = "Hello there world!"if let endIndex = greeting.range(of: "world!")?.lowerBound {    print(greeting[..<endIndex])}

outputs:

Hello there 

EDIT:

If you want to separate out the words, there's a quick-and-dirty way and a good way. The quick-and-dirty way:

import Foundationlet greeting = "Hello there world!"let words = greeting.split(separator: " ")print(words[1])

And here's the thorough way, which will enumerate all the words in the string no matter how they're separated:

import Foundationlet greeting = "Hello there world!"var words: [String] = []greeting.enumerateSubstrings(in: greeting.startIndex..<greeting.endIndex, options: .byWords) { substring, _, _, _ in    if let substring = substring {        words.append(substring)    }}print(words[1])

EDIT 2: And if you're just trying to get the 7th through the 11th character, you can do this:

import Foundationlet greeting = "Hello there world!"let startIndex = greeting.index(greeting.startIndex, offsetBy: 6)let endIndex = greeting.index(startIndex, offsetBy: 5)print(greeting[startIndex..<endIndex])

For swift4,

let string = "substring test"let start = String.Index(encodedOffset: 0)let end = String.Index(encodedOffset: 10)let substring = String(string[start..<end])

In Swift 5 encodedOffset (swift 4 func) is deprecated.
You will need to use utf160Offset

// Swift 5     let string = "Hi there! It's nice to meet you!"let startIndex = 10 // random for this examplelet endIndex = string.countlet start = String.Index(utf16Offset: startIndex, in: string)let end = String.Index(utf16Offset: endIndex, in: string)let substring = String(string[start..<end])

prints -> It's nice to meet you!