ios - 从字符串swift 3中获取特定范围的字符

Question

我想从我的字符串中获取特定字符，例如这样

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

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

我如何从 str 中检索 @steve123

Answer 1

您可以使用正则表达式"\\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"
}