Split string data on a string match

2019-05-31 04:45发布

站内问答 / 移动开发
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I'm working with some xml and I'd like to clean it up before I parse it. What i'd like to do specifically, is take the data (example below) and match it on the string "<data>" and then trim everything before it leaving the node in tact. Then I would match on the string "</data>" and truncate everything after it, once again leaving the matched node in tact.

Turning this: 

<dwml>
   <head>
      <child></child>
   </head>
   <data>
      <child></child>
      <child></child>
   </data>
   <more></more>
</dwml>

into this:

<data>
   <child></child>
   <child></child>
</data>

My Question:

While I am sure there is a way to do this, I don't know where to start. Could someone could point me in the right direction or better yet provide an example? I appreciate any help.

1条回答
一纸荒年 Trace。
2楼-- · 2019-05-31 05:10

You can use componentsSeparatedByString to isolate your elements as follow:

let xmlString = "<dwml><head><child></child></head><data><child></child><child></child></data><more></more></dwml>"

func filterData(input: String) -> String {
    return "<data>" + input.componentsSeparatedByString("<data>").last!.componentsSeparatedByString("</data>").first! + "</data>"
}

filterData(xmlString) // "<data><child></child><child></child></data>"

You can also use rangeOfString to find the range of your string:

func findData(input: String) -> String {
    if let startIndex = input.rangeOfString("<data>", options: NSStringCompareOptions.LiteralSearch, range: nil, locale: nil)?.startIndex {
        if let endIndex = input.rangeOfString("</data>", options: NSStringCompareOptions.LiteralSearch, range: nil, locale: nil)?.endIndex {
            return input.substringWithRange(startIndex..<endIndex)
        }
    }
    return ""
}

findData(xmlString)  // "<data><child></child><child></child></data>"
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