在 Swift 中的前 N 个字符后插入字符

发布于 2025-01-11 17:53:45 字数 557 浏览 0 评论 0原文

我返回了一个字符串 let myData = "0000006215342" 并且我只想分隔字符串扩展方法定义的第一个字符

    func separating(every: Int, separator: String) -> String {
       let regex = #"(.{\#(every)})(?=.)"#
       return self.replacingOccurrences(of: regex, with: "$1\(separator)", options: [.regularExpression])
    }

调用我的方法的实际结果就像

mylabel.text = myData.separating(every: 6, separator: " ")

应用我的方法的实际结果是 < code>"000000 621534 2" 但这是错误的，因为我只想分隔第一个字符，例如 "000000 6215342" 如何编辑正则表达式来分隔前 N 个字符？

原文

I have an String returned let myData = "0000006215342" and I want to separate only the firs characters defined by a String extension method

    func separating(every: Int, separator: String) -> String {
       let regex = #"(.{\#(every)})(?=.)"#
       return self.replacingOccurrences(of: regex, with: "$1\(separator)", options: [.regularExpression])
    }

The actual result calling my method are like

mylabel.text = myData.separating(every: 6, separator: " ")

The actual result of applying my method are "000000 621534 2" but this is wrong because I want to separate only the first characters like "000000 6215342" how I can edit my regex to separate my first N characters ?

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清眉祭 2025-01-18 17:53:45

您只需将正则表达式模式锚定到字符串的开头：

let regex = #"^(.{\#(every)})"#

You just need to anchor your regex pattern to the start of the string:

let regex = #"^(.{\#(every)})"#

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滥情稳全场 2025-01-18 17:53:45

这非常简单，不需要任何正则表达式，只需使用字符串切片：

extension String {
    func separating(every groupSize: Int, separator: String) -> String {
        guard let separatorIndex = index(startIndex, offsetBy: groupSize, limitedBy: endIndex) else {
            return self // The string is too short so no separators are necessary 
        }
        return String(self[..<separatorIndex] + Substring(separator) + self[separatorIndex...])
    }
}

let myData = "0000006215342"
let result = myData.separating(every: 6, separator: " ")
print(result) // => "000000 6215342"

This is really simple to do without any regular expressions being required, just using a String slice:

extension String {
    func separating(every groupSize: Int, separator: String) -> String {
        guard let separatorIndex = index(startIndex, offsetBy: groupSize, limitedBy: endIndex) else {
            return self // The string is too short so no separators are necessary 
        }
        return String(self[..<separatorIndex] + Substring(separator) + self[separatorIndex...])
    }
}

let myData = "0000006215342"
let result = myData.separating(every: 6, separator: " ")
print(result) // => "000000 6215342"

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