Question

我有一个类似100 + 8 - 9 + 10的字符串，如何获取数组中的["100", "+", "8", "-", "9", "+", "10"]。

let string = "100 + 8 - 9 + 10"
let splitted = string.split(omittingEmptySubsequences: true, whereSeparator: { ["+", "-"].contains(String($0)) })

但是我得到了["100", "8", "9", "10"]，我输了+和-，有什么好方法吗？谢谢！

编辑感谢您的评论，不保证空格。可能像“ 100 + 8-9”。

Answer 1

您可以将字符串用空格分开。

let splitted = string.split(separator: " ")

splitted的值为

["100", "+", "8", "-", "9", "+", "10"]

Answer 2

如果您不知道字符串是否包含空格，则应该使用Scanner

let string = "100 + 8 - 9 + 10"

let removed = string.replacingOccurrences(of: " ", with: "")
// "100+8-9+10"

let scanner = Scanner(string: removed)

let operators = CharacterSet(charactersIn: "+-*/")

var components: [String] = []

while !scanner.isAtEnd {
    var value: Int = 0
    if scanner.scanInt(&value) {
        components.append("\(value)")
    }

    var op: NSString? = ""
    if scanner.scanCharacters(from: operators, into: &op) {
        components.append(op! as String)
    }
}

print(components)

// ["100", "+", "8", "-", "9", "+", "10"]

迅速如何分割字符串但包含分隔符

2 个答案: