iOS Swift操纵/解析字符串

问题描述：

我不确定如何在iOS Swift中执行此操作

I'm not sure how to do this in iOS Swift

let test = "fnfsjflsjlkdkfj?v=904kg4"
// search test for ?v= and store everything after ?v= into a new string
let newString = "904kg4"

我想要一切之后？v =成新的字符串，这可能吗？如果是这样，我怎么能完成这个

I want everything after ?v= into a new string, is this possible? if so, how can I accomplish this

答

使用 rangeOfString 来查找范围？v = 然后使用 substringFromIndex 来获取字符串的其余部分：

Use rangeOfString to find the range of ?v= and then use substringFromIndex to get the rest of the string:

let test = "fnfsjflsjlkdkfj?v=904kg4"
if let range = test.rangeOfString("?v=") {
    let newString = test.substringFromIndex(range.endIndex)
}