查找字符串中的3个字符中的1个

Question

我必须在字符串中找到3个字符中的1个。我怎样才能做到这一点？

我尝试这样做：

let value = "from 3,95 €" 
let wanted: Character = "£", "€" OR "₹" 
if let idx = value.characters.index(of: wanted) {          
    print("Found \(wanted)") 
} else { 
    print("Not found") 
} 

谢谢！

Answer 1

并不确切地知道你想要达到的目标，但如果你想知道哪些字符串从这3个字符包含，那么你可以做出这样的事情。

let value = "from 3,95 €" 
let wanted: [Character] = ["£", "€", "₹"] 
if let result = value.characters.first(where: { wanted.contains($0) }) { 
    print("Found \(result)") 
} else { 
    print("Not found") 
} 

输出

Found € 

编辑：如果你只是要检查字符串中包含然后用contains(where:)代替first(where:)

if value.characters.contains(where: { wanted.contains($0) }) { 
    print("Found") 
} else { 
    print("Not found") 
} 

Answer 2

，如果你只想确定它们是否存在试试这个：

let value = "from 3,95 €" 
let wanted = CharacterSet(charactersIn: "£€₹") 
if value.rangeOfCharacter(from: wanted) != nil { 
    print("Found") 
} else { 
    print("Not found") 
} 

Answer 3

斯威夫特3：

if let dataArray = value.characters.filter{ $0 == "£" || $0 == "€" || $0 == "₹" }, dataArray.count > 0 { 
//you have at least one of them in your string, so do whatever you want here 
}