Swift String.range에 대해

stringParsing.swift

let text = "가나다라마바사아자차"

func stringParsing(text:String) -> (String,String,String)? {
    let index0 = text.startIndex
    let indexE = text.endIndex
    let result = text[index0 ..< indexE]
    print(result)
    
    guard text.contains("다라") else { return nil }
    
    if let range0 = text.range(of: "다라") {
        let startWord = text[range0].startIndex
        let endWord = text[range0].endIndex
        let w0 = text[text.startIndex ..< startWord]
        let w1 = text[startWord ..< endWord]
        let w2 = text[endWord ..< text.endIndex]
        return (String(w0),String(w1),String(w2))
    } else {
     return nil
    }
}

if let word = stringParsing(text: text) {
    print("\(word.0)\n\(word.1)\n\(word.2)")
}