(快速)解析字符串的功能(从-到) [英] (Swift) Function to parse string (from-to)

问题描述

还有其他方法可以解析字符串从-到"吗? 我的意思是，当我们需要一个值时，我们会在字符串前后对其有所了解. 我刚刚创建了这样的功能

Is any other ways to parse string "from-to"? I mean when there is a value we need and we know about string before and after it. I`ve just created such function as

func parser(textToParse:String, strFrom:String, strTo:String) -> String {
        return textToParse.componentsSeparatedByString(strFrom)[1].componentsSeparatedByString(strTo)[0]
    }

使用类似

var s=parser("abc", strFrom: "a", strTo: "c")
//s will be "b"

推荐答案

您可以使用substringWithRange做这样的事情:

You could do something like this using substringWithRange:

func substringBetween(start: String, and end: String) -> String? {
    if let startIndex = rangeOfString(start, options: .LiteralSearch, range: nil, locale: nil)?.endIndex,
           endIndex = rangeOfString(end, options: .LiteralSearch, range: startIndex..<self.endIndex, locale: nil)?.startIndex {
        return substringWithRange(startIndex..<endIndex)
    } else {
        return nil
    }
}

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