獲取特定的字符範圍從字符串SWIFT 3

Question

我想從我的字符串得到具體的人物，像這樣的例子

var str = "hey steve @steve123, you would love this!" 

// Without doing this 
var theCharactersIWantFromTheString = "@steve123" 

我怎麼會只檢索海峽

的@ steve123

Answer 1

你可以使用正則表達式"\\B\\@\\w+"。

let pattern = "\\B\\@\\w+" 
let sentence = "hey steve @steve123, you would love this!" 

if let range = sentence.range(of: pattern, options: .regularExpression) { 
    print(sentence.substring(with: range)) // "@steve123\n" 
}