swift - replacingOccurrences() 中的错误？

Question

我在想是不是String函数replacingOccurrences(of: String, with: String)有bug:

let s = "Hello     World!"
let cleaned : String = s.replacingOccurrences(of: "  ", with: " ")
print("cleaned = '\(cleaned)'")

我想把多个空格换成一个

"  " to " "

但字符串保持不变。我已经在 obj-c 中这样做了数百次，所以这是 Swift 中的错误吗？

Answer 1

这不是错误。您正在用一个空格替换每次出现的 2 个空格。该方法不递归工作，因此 5 个空格减少为 3 个。

您可以使用正则表达式，它将所有出现的一个或多个空格替换为一个空格:

let s = "Hello     World!"
let cleaned = s.replacingOccurrences(of: " +", with: " ", options: .regularExpression)
print("cleaned = '\(cleaned)'")