Question

我是正则表达式的新手！我想从字符串中获取特定的JSON对象，该对象可能包含多个JSON对象。我在文件中有类似的行，如下所示，

Mon Jan 20 00:00:21 - 0800 2014，

{ “CL”： “JS”， “上”： “AAA”， “IP”： “50.100.200.210”， “CC”： “US”， “RG”： “CA”， “CT”： “民航局”， “PC”： “94538”， “MC”：807， “BF”： “9d9b0900247ab80b9dc4c60013245fa36d8d4dc4”， “伟仕”： “2074ae4d-9969-4103-9637-92a31ba8a108”， “LT”：“星期一 1月20日00：00：14 -0800 2014“，”hk“：[”sub“，”hatch“]}， { “V”： “1.1”， “PV”： “cc4c68d2-54b3-4607-9578-619f68b97947”， “R”： “V3”， “T”： “f1951bc8”， “一个”：[{ “i” 的：2， “U”： “u.jpg”， “W”：800， “H”：532， “×”：198， “Y”：1655， “LT”： “无”， “AF”：假}]， “RF”： “正则表达式”， “p”： “阶”， “FS”：真， “TR”：0.9， “AC”：{ “20722”：1}， “VP”：{“二“：假，” W “：1905，” H “：955}，” SC “：{” W “：1920，” H “：1080，” d “：1}，” PID “：7343，” VID” ：8}

我想解析整个字符串并将JSON对象解压缩为JSON字符串，该字符串包含第三列JSON对象中的键“pv”。可能有一些行没有第一个JSON对象，但行中有时间列和第二个JSON对象。

我从另一个帖子中找到了\{([^{}]|)*\}这个匹配第一个JSON对象和第二个对象的部分表达式！我需要从总线中获得第二个JSON，其结构中有“pv”键！对给定表达式的任何建议只能得到第三列!!

Answer 1

您可以像这样使用liftweb json库：

import net.liftweb.json._
val p = net.liftweb.json.parse("""[{"cl":"js","up":"aaa","ip":"50.100.200.210","cc":"US","rg":"CA","ct":"CAA","pc":"94538","mc":807,"bf":"9d9b0900247ab80b9dc4c60013245fa36d8d4dc4","vst":"2074ae4d-9969-4103-9637-92a31ba8a108","lt":"Mon Jan 20 00:00:14 -0800 2014","hk":["sub","hatch"]}, {"v":"1.1","pv":"cc4c68d2-54b3-4607-9578-619f68b97947","r":"v3","t":"f1951bc8","a":[{"i":2,"u":"u.jpg","w":800,"h":532,"x":198,"y":1655,"lt":"none","af":false}],"rf":"regex","p":"scala","fs":true,"tr":0.9,"ac":{"20722":1},"vp":{"ii":false,"w":1905,"h":955},"sc":{"w":1920,"h":1080,"d":1},"pid":7343,"vid":8}]""")
compact(render(p \\ "pv"))
res3: String = "cc4c68d2-54b3-4607-9578-619f68b97947"

\\运算符执行搜索给定键。有关详细信息，请参阅此处：https://github.com/lift/lift/tree/master/framework/lift-base/lift-json

注意 - 我在json字符串的开头和结尾添加了方括号，以便它是有效的json ..

Answer 2

你也可以像这样使用原生的scala json库：

val p2 = scala.util.parsing.json.JSON.parseFull("""[{"cl":"js","up":"aaa","ip":"50.100.200.210","cc":"US","rg":"CA","ct":"CAA","pc":"94538","mc":807,"bf":"9d9b0900247ab80b9dc4c60013245fa36d8d4dc4","vst":"2074ae4d-9969-4103-9637-92a31ba8a108","lt":"Mon Jan 20 00:00:14 -0800 2014","hk":["sub","hatch"]}, {"v":"1.1","pv":"cc4c68d2-54b3-4607-9578-619f68b97947","r":"v3","t":"f1951bc8","a":[{"i":2,"u":"u.jpg","w":800,"h":532,"x":198,"y":1655,"lt":"none","af":false}],"rf":"regex","p":"scala","fs":true,"tr":0.9,"ac":{"20722":1},"vp":{"ii":false,"w":1905,"h":955},"sc":{"w":1920,"h":1080,"d":1},"pid":7343,"vid":8}]""")

p2.flatMap { l => Some(l.asInstanceOf[List[Map[String,Any]]]) }.
  flatMap(l2 => { Some(l2.flatMap( m => {
    m.get("pv")
  }))
})

res37: Option[List[Any]] = Some(List(cc4c68d2-54b3-4607-9578-619f68b97947))

正则表达式匹配文件

2 个答案: