C# 查找 2 个已知值之间的字符串
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Find a string between 2 known values
提问by Ashley
I need to be able to extract a string between 2 tags for example: "00002" from "morenonxmldata<tag1>0002</tag1>morenonxmldata"
我需要能够在 2 个标签之间提取一个字符串，例如：“00002” from " morenonxmldata<tag1>0002</tag1>morenonxmldata"
I am using C# and .NET 3.5.
我正在使用 C# 和 .NET 3.5。
采纳答案by Mehrdad Afshari
Solution without need of regular expression:
不需要正则表达式的解决方案：
string ExtractString(string s, string tag) {
// You should check for errors in real-world code, omitted for brevity
var startTag = "<" + tag + ">";
int startIndex = s.IndexOf(startTag) + startTag.Length;
int endIndex = s.IndexOf("</" + tag + ">", startIndex);
return s.Substring(startIndex, endIndex - startIndex);
}
回答by Aaron
Regex regex = new Regex("<tag1>(.*)</tag1>");
var v = regex.Match("morenonxmldata<tag1>0002</tag1>morenonxmldata");
string s = v.Groups[1].ToString();
Or (as mentioned in the comments) to match the minimal subset:
或者（如评论中所述）匹配最小子集：
Regex regex = new Regex("<tag1>(.*?)</tag1>");
Regexclass is in System.Text.RegularExpressionsnamespace.
Regex类在System.Text.RegularExpressions命名空间中。
回答by Marc Gravell
A Regexapproach using lazy match and back-reference:
一个Regex用懒惰匹配和反向引用的方法：
foreach (Match match in Regex.Matches(
"morenonxmldata<tag1>0002</tag1>morenonxmldata<tag2>abc</tag2>asd",
@"<([^>]+)>(.*?)</>"))
{
Console.WriteLine("{0}={1}",
match.Groups[1].Value,
match.Groups[2].Value);
}
回答by Nime Cloud
For future reference, I found this code snippet at http://www.mycsharpcorner.com/Post.aspx?postID=15If you need to search for different "tags" it works very well.
为了将来参考，我在http://www.mycsharpcorner.com/Post.aspx?postID=15找到了这个代码片段如果你需要搜索不同的“标签”，它工作得很好。
public static string[] GetStringInBetween(string strBegin,
string strEnd, string strSource,
bool includeBegin, bool includeEnd)
{
string[] result ={ "", "" };
int iIndexOfBegin = strSource.IndexOf(strBegin);
if (iIndexOfBegin != -1)
{
// include the Begin string if desired
if (includeBegin)
iIndexOfBegin -= strBegin.Length;
strSource = strSource.Substring(iIndexOfBegin
+ strBegin.Length);
int iEnd = strSource.IndexOf(strEnd);
if (iEnd != -1)
{
// include the End string if desired
if (includeEnd)
iEnd += strEnd.Length;
result[0] = strSource.Substring(0, iEnd);
// advance beyond this segment
if (iEnd + strEnd.Length < strSource.Length)
result[1] = strSource.Substring(iEnd
+ strEnd.Length);
}
}
else
// stay where we are
result[1] = strSource;
return result;
}
回答by Vova Popov
public string between2finer(string line, string delimiterFirst, string delimiterLast)
{
string[] splitterFirst = new string[] { delimiterFirst };
string[] splitterLast = new string[] { delimiterLast };
string[] splitRes;
string buildBuffer;
splitRes = line.Split(splitterFirst, 100000, System.StringSplitOptions.RemoveEmptyEntries);
buildBuffer = splitRes[1];
splitRes = buildBuffer.Split(splitterLast, 100000, System.StringSplitOptions.RemoveEmptyEntries);
return splitRes[0];
}
private void button1_Click(object sender, EventArgs e)
{
string manyLines = "Received: from exim by isp2.ihc.ru with local (Exim 4.77) \nX-Failed-Recipients: [email protected]\nFrom: Mail Delivery System <[email protected]>";
MessageBox.Show(between2finer(manyLines, "X-Failed-Recipients: ", "\n"));
}
回答by Sedrick
I strip before and after data.
我在数据之前和之后剥离。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;
namespace testApp
{
class Program
{
static void Main(string[] args)
{
string tempString = "morenonxmldata<tag1>0002</tag1>morenonxmldata";
tempString = Regex.Replace(tempString, "[\s\S]*<tag1>", "");//removes all leading data
tempString = Regex.Replace(tempString, "</tag1>[\s\S]*", "");//removes all trailing data
Console.WriteLine(tempString);
Console.ReadLine();
}
}
}
回答by Tom
Without RegEx, with some must-have value checking
没有正则表达式，有一些必备的值检查
public static string ExtractString(string soapMessage, string tag)
{
if (string.IsNullOrEmpty(soapMessage))
return soapMessage;
var startTag = "<" + tag + ">";
int startIndex = soapMessage.IndexOf(startTag);
startIndex = startIndex == -1 ? 0 : startIndex + startTag.Length;
int endIndex = soapMessage.IndexOf("</" + tag + ">", startIndex);
endIndex = endIndex > soapMessage.Length || endIndex == -1 ? soapMessage.Length : endIndex;
return soapMessage.Substring(startIndex, endIndex - startIndex);
}
回答by Ozesh
Extracting contents between two known values can be useful for later as well. So why not create an extension method for it. Here is what i do, Short and simple...
提取两个已知值之间的内容对以后也很有用。那么为什么不为它创建一个扩展方法。这就是我所做的，简短而简单......
public static string GetBetween(this string content, string startString, string endString)
{
int Start=0, End=0;
if (content.Contains(startString) && content.Contains(endString))
{
Start = content.IndexOf(startString, 0) + startString.Length;
End = content.IndexOf(endString, Start);
return content.Substring(Start, End - Start);
}
else
return string.Empty;
}
回答by Matinee LA
string input = "Exemple of value between two string FirstString text I want to keep SecondString end of my string";
var match = Regex.Match(input, @"FirstString (.+?) SecondString ").Groups[1].Value;
回答by Vijay Nirmal
To get Single/Multiple values without regular expression
在没有正则表达式的情况下获取单个/多个值
// For Single
var value = inputString.Split("<tag1>", '</tag1>')[1];
// For Multiple
var values = inputString.Split("<tag1>", '</tag1>').Where((_, index) => index % 2 != 0);
