Find a string between 2 known values

Question

I need to be able to extract a string between 2 tags for example   00002  from  morenonxmldata lt tag1 gt 0002 lt  tag1 gt morenonxmldata   I am using C  and  NET 3 5

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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

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Solution without need of regular expression   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

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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      Or  as mentioned in the comments  to match the minimal subset     Regex regex   new Regex   lt tag1 gt       lt  tag1 gt       Regex class is in System Text RegularExpressions namespace

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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       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

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Without RegEx  with some must-have value checking      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

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A Regex approach using lazy match and back-reference   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

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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

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I strip before and after data    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

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For future reference  I found this code snippet at http   www mycsharpcorner com Post aspx postID 15 If you need to search for different  tags  it works very well       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

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To get Single Multiple values without regular expression     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

[c#] Find a string between 2 known values

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