blocks|key|1410170|text|不需要正则表达式的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410171|string+ExtractString(string+s,+string+tag)+{
+++++//+You+should+check+for+errors+in+real-world+code,+omitted+for+brevity
+++++var+startTag+=+"<"+%2B+tag+%2B+">";
+++++int+startIndex+=+s.IndexOf(startTag)+%2B+startTag.Length;
+++++int+endIndex+=+s.IndexOf("</"+%2B+tag+%2B+">",+startIndex);
+++++return+s.Substring(startIndex,+endIndex+-+startIndex);
}|code-block|syntax|javascript|1410172|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Solution without need of regular expression:

<pre><code>string ExtractString(string s, string tag) {
 // You should check for errors in real-world code, omitted for brevity
 var startTag = "&lt;" + tag + "&gt;";
 int startIndex = s.IndexOf(startTag) + startTag.Length;
 int endIndex = s.IndexOf("&lt;/" + tag + "&gt;", startIndex);
 return s.Substring(startIndex, endIndex - startIndex);
}
</code></pre>

blocks|key|1194735|text|++Regex+regex+=+new+Regex("<tag1>(.*)</tag1>");
++var+v+=+regex.Match("morenonxmldata<tag1>0002</tag1>morenonxmldata");
++string+s+=+v.Groups[1].ToString();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1194736|或者(如注释中所述)匹配最小子集：|unstyled|1194737|++Regex+regex+=+new+Regex("<tag1>(.*?)</tag1>");|1194738|Regex类位于System.Text.RegularExpressions命名空间中。|offset|length|style|CODE|1194739|entityMap^0|0|0|0|0|5|8|U|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|T|8|@$K|U|L|V|M|N]|$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|F|7|Y|8|@]|9|@]|A|$]]]|P|$]]

<pre><code> Regex regex = new Regex("&lt;tag1&gt;(.*)&lt;/tag1&gt;");
 var v = regex.Match("morenonxmldata&lt;tag1&gt;0002&lt;/tag1&gt;morenonxmldata");
 string s = v.Groups[1].ToString();
</code></pre>

Or (as mentioned in the comments) to match the minimal subset:

<pre><code> Regex regex = new Regex("&lt;tag1&gt;(.*?)&lt;/tag1&gt;");
</code></pre>

<code>Regex</code> class is in <code>System.Text.RegularExpressions</code> namespace.

blocks|key|1410232|text|一种使用惰性匹配和反向引用的Regex方法：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1410233|foreach+(Match+match+in+Regex.Matches(
++++++++"morenonxmldata<tag1>0002</tag1>morenonxmldata<tag2>abc</tag2>asd",
++++++++@"<([%5E>]%2B)>(.*?)</\1>"))
{
++++Console.WriteLine("{0}={1}",
++++++++match.Groups[1].Value,
++++++++match.Groups[2].Value);
}|code-block|syntax|javascript|1410234|entityMap^0|E|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

A <code>Regex</code> approach using lazy match and back-reference:

<pre><code>foreach (Match match in Regex.Matches(
 "morenonxmldata&lt;tag1&gt;0002&lt;/tag1&gt;morenonxmldata&lt;tag2&gt;abc&lt;/tag2&gt;asd",
 @"&lt;([^&gt;]+)&gt;(.*?)&lt;/\1&gt;"))
{
 Console.WriteLine("{0}={1}",
 match.Groups[1].Value,
 match.Groups[2].Value);
}
</code></pre>

blocks|key|1195127|text|在两个已知值之间提取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呢？这就是我要做的，简短而简单。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1195128|++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)+%2B+startString.Length;
++++++++++++End+=+content.IndexOf(endString,+Start);
++++++++++++return+content.Substring(Start,+End+-+Start);
++++++++}
++++++++else
++++++++++++return+string.Empty;
++++}|code-block|syntax|javascript|1195129|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

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...

<pre><code> public static string GetBetween(this string content, string startString, string endString)
 {
 int Start=0, End=0;
 if (content.Contains(startString) &amp;&amp; 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;
 }
</code></pre>

blocks|key|1410521|text|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+(.%2B?)+SecondString+").Groups[1].Value;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1410522|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>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;
</code></pre>

blocks|key|1410292|text|为了将来参考，我在http://www.mycsharpcorner.com/Post.aspx?postID=15上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。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1410293|++++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
++++++++++++++++%2B+strBegin.Length);
++++++++++++int+iEnd+=+strSource.IndexOf(strEnd);
++++++++++++if+(iEnd+!=+-1)
++++++++++++{
++++++++++++++++//+include+the+End+string+if+desired
++++++++++++++++if+(includeEnd)
++++++++++++++++++++iEnd+%2B=+strEnd.Length;
++++++++++++++++result[0]+=+strSource.Substring(0,+iEnd);
++++++++++++++++//+advance+beyond+this+segment
++++++++++++++++if+(iEnd+%2B+strEnd.Length+<+strSource.Length)
++++++++++++++++++++result[1]+=+strSource.Substring(iEnd
++++++++++++++++++++++++%2B+strEnd.Length);
++++++++++++}
++++++++}
++++++++else
++++++++++++//+stay+where+we+are
++++++++++++result[1]+=+strSource;
++++++++return+result;
++++}|code-block|syntax|javascript|1410294|entityMap|0|LINK|mutability|MUTABLE|url|http://www.mycsharpcorner.com/Post.aspx?postID=15^0|9|1D|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

For future reference, I found this code snippet at <a href="http://www.mycsharpcorner.com/Post.aspx?postID=15" rel="nofollow">http://www.mycsharpcorner.com/Post.aspx?postID=15</a> If you need to search for different "tags" it works very well.

<pre><code> 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 &lt; strSource.Length)
 result[1] = strSource.Substring(iEnd
 + strEnd.Length);
 }
 }
 else
 // stay where we are
 result[1] = strSource;
 return result;
 }
</code></pre>

blocks|key|1410554|text|在没有正则表达式的情况下获取单个/多个值|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410555|//+For+Single
var+value+=+inputString.Split("<tag1>",+'</tag1>')[1];

//+For+Multiple
var+values+=+inputString.Split("<tag1>",+'</tag1>').Where((_,+index)+=>+index+%25+2+!=+0);|code-block|syntax|javascript|1410556|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To get Single/Multiple values without regular expression

<pre><code>// For Single
var value = inputString.Split("&lt;tag1&gt;", '&lt;/tag1&gt;')[1];

// For Multiple
var values = inputString.Split("&lt;tag1&gt;", '&lt;/tag1&gt;').Where((_, index) =&gt; index % 2 != 0);
</code></pre>

blocks|key|1410394|text|我在数据之前和之后剥离数据。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410395|+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();
+++++++++}
+++++}
+}|code-block|syntax|javascript|1410396|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I strip before and after data.

<pre><code> 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&lt;tag1&gt;0002&lt;/tag1&gt;morenonxmldata";
 tempString = Regex.Replace(tempString, "[\\s\\S]*&lt;tag1&gt;", "");//removes all leading data
 tempString = Regex.Replace(tempString, "&lt;/tag1&gt;[\\s\\S]*", "");//removes all trailing data

 Console.WriteLine(tempString);
 Console.ReadLine();
 }
 }
 }
</code></pre>

blocks|key|1410439|text|在没有RegEx的情况下，使用一些必备的值检查|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410440|++++public+static+string+ExtractString(string+soapMessage,+string+tag)
++++{
++++++++if+(string.IsNullOrEmpty(soapMessage))
++++++++++++return+soapMessage;

++++++++var+startTag+=+"<"+%2B+tag+%2B+">";
++++++++int+startIndex+=+soapMessage.IndexOf(startTag);
++++++++startIndex+=+startIndex+==+-1+?+0+:+startIndex+%2B+startTag.Length;
++++++++int+endIndex+=+soapMessage.IndexOf("</"+%2B+tag+%2B+">",+startIndex);
++++++++endIndex+=+endIndex+>+soapMessage.Length+%7C%7C+endIndex+==+-1+?+soapMessage.Length+:+endIndex;
++++++++return+soapMessage.Substring(startIndex,+endIndex+-+startIndex);
++++}|code-block|syntax|javascript|1410441|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Without RegEx, with some must-have value checking

<pre><code> public static string ExtractString(string soapMessage, string tag)
 {
 if (string.IsNullOrEmpty(soapMessage))
 return soapMessage;

 var startTag = "&lt;" + tag + "&gt;";
 int startIndex = soapMessage.IndexOf(startTag);
 startIndex = startIndex == -1 ? 0 : startIndex + startTag.Length;
 int endIndex = soapMessage.IndexOf("&lt;/" + tag + "&gt;", startIndex);
 endIndex = endIndex &gt; soapMessage.Length || endIndex == -1 ? soapMessage.Length : endIndex;
 return soapMessage.Substring(startIndex, endIndex - startIndex);
 }
</code></pre>

blocks|key|1194993|text|++++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:+rmnokixm@gmail.com\nFrom:+Mail+Delivery+System+<Mailer-Daemon@isp2.ihc.ru>";
++++++++MessageBox.Show(between2finer(manyLines,+"X-Failed-Recipients:+",+"\n"));
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1194994|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> 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: rmnokixm@gmail.com\nFrom: Mail Delivery System &lt;Mailer-Daemon@isp2.ihc.ru&gt;";
 MessageBox.Show(between2finer(manyLines, "X-Failed-Recipients: ", "\n"));
 }
</code></pre>

I need to be able to extract a string between 2 tags for example: "00002" from "<code>morenonxmldata&lt;tag1&gt;0002&lt;/tag1&gt;morenonxmldata</code>"

I am using C# and .NET 3.5.

Find a string between 2 known values

我需要能够提取两个标签之间的字符串例如："00002“从"morenonxmldata<tag1>0002</tag1>morenonxmldata”我使用的是C#和.NET 3.5。

问查找两个已知值之间的字符串
EN

回答 10

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问查找两个已知值之间的字符串EN

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问查找两个已知值之间的字符串
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