从主字符串中提取子字符串的值
本文关键字:字符串 提取 | 更新日期: 2023-09-27 18:10:00
我有一个像下面提到的字符串。
{
behavior_capture_widget: "<div id="ndwc"><noscript><input type="hidden" id="ndpd-spbd" name="ndpd-spbd" value="ndpds~~~2.4177.112540pPaGJYVmt5WCtndGlUiUcRt3aSOPQ,,"></noscript></div> <script type="text/javascript"></script>"
customer_session_data: "2.4177.112540.1399312572.2.mFDzrW_JJeu-C_H45O5ADQ"
customer_cookie_data: "2.4177.112540.1399312572.2.XYjAsjFsOVHFXBGNnnHc-g,,."
}
我将总是得到这种格式的字符串。
我必须提取
的值behavior_capture_widget
customer_session_data
customer_cookie_data
变量a,b,c
中的我是c#的新手,我试图使用substring()
, indexof()
的组合,但无济于事如果你能帮忙,我将不胜感激。
您可以使用string代替substring。分割,让你的大部分方式:
var input = "... your data ...";
var valueNames = new []
{
"behavior_capture_widget:",
"customer_session_data:",
"customer_cookie_data:"
};
var items = input.Split(valueNames, StringSplitOptions.RemoveEmptyEntries);
现在你可以提取你的值了:
var behaviorCaptureWidget = items[1].Trim();
var customerSessionData= items[2].Trim();
var customerCookieData= items[3].Trim().Replace("'"}", "");
注意最后一个需要手动删除尾部的"}
如果在执行之前不知道key: value
对中的键的名称,或者不知道期望键的顺序,则可以使用正则表达式和字典来存储任何键-值对:
class StrangeParser
{
public static readonly Regex LINE_REGEX = new Regex("^''s*([a-zA-Z0-9_]+)''s*'':''s*'"(.*)'"''s*$", RegexOptions.Multiline);
public static Dictionary<string, string> ParseStr(string str)
{
var m = LINE_REGEX.Matches(str);
var res = new Dictionary<string, string>();
foreach (Match item in m)
{
res.Add(item.Groups[1].Value, item.Groups[2].Value);
}
return res;
}
static void Main(string[] args)
{
foreach (var item in ParseStr(@"
{
behavior_capture_widget: ""<div id=""ndwc""><noscript><input type=""hidden"" id=""ndpd-spbd"" name=""ndpd-spbd"" value=""ndpds~~~2.4177.112540pPaGJYVmt5WCtndGlUiUcRt3aSOPQ,,""></noscript></div> <script type=""text/javascript""></script>""
customer_session_data: ""2.4177.112540.1399312572.2.mFDzrW_JJeu-C_H45O5ADQ""
customer_cookie_data: ""2.4177.112540.1399312572.2.XYjAsjFsOVHFXBGNnnHc-g,,.""
}
"))
{
Console.WriteLine(item.Key + " " + item.Value);
}
}
}
如果是JSON总是。我认为最好使用"Json"。网":
string json = @"{
{
behavior_capture_widget: "<div id='"ndwc'"><noscript><input type='"hidden'" id='"ndpd-spbd" name='"ndpd-spbd'" value='"ndpds~~~2.4177.112540pPaGJYVmt5WCtndGlUiUcRt3aSOPQ,,'"></noscript></div> <script type='"text/javascript'"></script>"
customer_session_data: "2.4177.112540.1399312572.2.mFDzrW_JJeu-C_H45O5ADQ"
customer_cookie_data: "2.4177.112540.1399312572.2.XYjAsjFsOVHFXBGNnnHc-g,,."
}";
Dictionary<string, string> dict = JsonConvert.DeserializeObject<Dictionary<string, string>>(json);
var mydata = dict["customer_cookie_data"]; // extraction
看这里
如果您要广泛使用这种格式,那么为这种语法设计一个解析器可能是值得的。
可以使用解析器组合子来定义语法树。
使用Sprache,我构建了这个解析器,它给了你一个Dictionary<string, string>
:
var key = Parse.CharExcept(c => char.IsWhiteSpace(c) || c == ':', "").Many().Text();
var value =
from leading in Parse.Char('"')
from val in Parse.AnyChar.Until(Parse.Char('"').Then(_ => Parse.LineEnd)).Text()
select val;
var separator =
from x in Parse.WhiteSpace.Many()
from colon in Parse.Char(':')
from y in Parse.WhiteSpace.Many()
select colon;
var keyValue =
from k in key
from s in separator
from v in value
select new KeyValuePair<string, string>(k, v);
var parser =
from open in Parse.Char('{').Then(_ => Parse.WhiteSpace.Many())
from kvs in keyValue.DelimitedBy(Parse.WhiteSpace.Many())
from close in Parse.WhiteSpace.Many().Then(_ => Parse.Char('}'))
select kvs.ToDictionary(kv => kv.Key, kv => kv.Value);
你现在可以这样使用这个解析器:
var dictionary = parser.Parse(input);