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Duck
Asked: 2024-03-23 00:36:21 +0800 CST

如何从字符串中删除智能引号？

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我有一个像这样的字符串：

let muString = "\n\nFebruary 11, 2012\n\nThis natural-color image showing Acme Inc\'s logo... bla bla bla “Mount Everest”... bla bla 'Black Viper' ... bla bla. \"Naja\""

换句话说，我有智能引号

````````````

（注意：SO 没有正确渲染前面的字符。我的意思是它们正在打开和关闭卷曲单引号和双引号）。

还有双引号，我想用一个纯 ASCII 引号替换所有内容。

我创建了这个扩展：

extension String {
  func plainText() -> String {
    var newString = self.replacingOccurrences(of: "\u{0060}", with: "'")
    newString = self.replacingOccurrences(of: "\u{00b4}", with: "'")
    newString = self.replacingOccurrences(of: "\u{2018}", with: "'")
    newString = self.replacingOccurrences(of: "\u{2019}", with: "'")
    newString = self.replacingOccurrences(of: "\u{201c}", with: "'")
    newString = self.replacingOccurrences(of: "\u{201d}", with: "'")
    newString = self.replacingOccurrences(of: "\"", with: "'")
    return newString
  }
}

但做

print (myString.plainText())

给了我和独自一人一样的感觉myString。

换句话说，扩展程序不会清除任何内容。

有任何想法吗？

swift

1 个回答

  1. Best Answer

    所以replacingOccurrences返回一个新的字符串。self在函数内部调用它意味着您始终在原始字符串本身上调用它。这意味着只有您最后一次调用replacingOccurrences才被实际使用。您应该始终在 on 上调用它replacingOccurrences，而不是self总是在 on 上调用它newString：

    extension String {
  func plainText() -> String {
    var newString = self.replacingOccurrences(of: "\u{0060}", with: "'")
    newString = newString.replacingOccurrences(of: "\u{00b4}", with: "'")
    newString = newString.replacingOccurrences(of: "\u{2018}", with: "'")
    newString = newString.replacingOccurrences(of: "\u{2019}", with: "'")
    newString = newString.replacingOccurrences(of: "\u{201c}", with: "'")
    newString = newString.replacingOccurrences(of: "\u{201d}", with: "'")
    newString = newString.replacingOccurrences(of: "\"", with: "'")
    return newString
  }
}

    或者你可以直接链接调用，这样更干净。

    extension String {
  func plainText() -> String {
    return replacingOccurrences(of: "\u{0060}", with: "'")
          .replacingOccurrences(of: "\u{00b4}", with: "'")
          .replacingOccurrences(of: "\u{2018}", with: "'")
          .replacingOccurrences(of: "\u{2019}", with: "'")
          .replacingOccurrences(of: "\u{201c}", with: "'")
          .replacingOccurrences(of: "\u{201d}", with: "'")
          .replacingOccurrences(of: "\"", with: "'")
  }
}
    • 1

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