Question

我是Swift Programming的新手。我想问一下是否有人可以帮我从字符串中只返回字母数字子字符串？

示例：

输入=“狼与狮子”
输出=“wolflion”

我想知道除了正则表达式之外是否有任何解决方案谢谢

Answer 1

试试这个：

let outputStr = "wolf & lion".components(separatedBy: CharacterSet.alphanumerics.inverted)
                .joined()
print(outputStr)//wolflion

Answer 2

var a = "abs1  2csd^!@awerqwe"
let b =  a.characters.map { (char) -> String in
    if let charRange = String(char).rangeOfCharacter(from: CharacterSet.alphanumerics) {
        return String(char)
    } else {
        return ""
    }
}.joined()

//OR use unicode scalar
let c = a.unicodeScalars.map { (char) -> String in
    if CharacterSet.alphanumerics.contains(char) {
        return String(char)
    } else {
        return ""
    }
}.joined()

输出：abs12csdawerqwe

Answer 3

请检查：

let str = "wolf & lion"
let charset = str.trimmingCharacters(in: CharacterSet.alphanumerics)
let alphanumericString = str.components(separatedBy: charset).joined(separator: "")
print(alphanumericString) // wolflion

如何只返回字母数字子串？

3 个答案: