使用正则表达式：

（？< = MessageContent :)。*？（？= MessageContentEnd：）

每个匹配将是标题和预告片之间的完整内容：

  //  使用System.Text.RegularExpressions;  

 ///   <  摘要 >  
  ///  为C＃开发的正则表达式：星期四，2015年7月16日，01：39：25 PM 
  ///  使用Expresso版本：3.0.3634，http：//www.ultrapico.com 
  ///   
  ///  正则表达式的描述：
  ///   
  ///  匹配前缀但将其从捕获中排除。 [MessageContent：] 
  ///   MessageContent：
  ///   MessageContent：
  ///  任意字符，任意数量的重复，尽可能少
  ///  匹配后缀但将其从捕获中排除。 [MessageContentEnd：] 
  ///   MessageContentEnd：
  ///   MessageContentEnd：
  ///   
  ///   
  ///   <   / summary  >  
 public  静态正则表达式正则表达式= 新正则表达式（
 （？< = MessageContent :)。*？（？= MessageContentEnd :)，
 RegexOptions.IgnoreCase 
 | RegexOptions.Multiline 
 |正则表达式Options.Singleline 
 | RegexOptions.CultureInvariant 
 | RegexOptions.IgnorePatternWhitespace 
 | RegexOptions.Compiled 
）; 
 //  捕获InputText中的所有匹配项 
 MatchCollection ms = regex.Matches （inputText的）; 

How read the line between two substring in c#

MessageContent: =Current Status: XXXXXXXXXXXXXXXX.

User Experience: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.

Customer Impact: XXXXXXXXXXXXXXX.

Incident Start Time: Wednesday, July 15, 2015, at 9:25 PM UTC

Preliminary Root Cause: XXXXXXXXXXXXXXXXXXXXXXXXX.

Next Update by: Thursday, July 16, 2015, at 2:30 AM

MessageContentEnd:

I need to get the values between MessageContent and MessageContentEnd:

Use a regex:

(?<=MessageContent:).*?(?=MessageContentEnd:)

Each match will be the complete content between the header and trailer:

//  using System.Text.RegularExpressions;

/// <summary>
///  Regular expression built for C# on: Thu, Jul 16, 2015, 01:39:25 PM
///  Using Expresso Version: 3.0.3634, http://www.ultrapico.com
///  
///  A description of the regular expression:
///  
///  Match a prefix but exclude it from the capture. [MessageContent:]
///      MessageContent:
///          MessageContent:
///  Any character, any number of repetitions, as few as possible
///  Match a suffix but exclude it from the capture. [MessageContentEnd:]
///      MessageContentEnd:
///          MessageContentEnd:
///  
///
/// </summary>
public static Regex regex = new Regex(
      "(?<=MessageContent:).*?(?=MessageContentEnd:)",
    RegexOptions.IgnoreCase
    | RegexOptions.Multiline
    | RegexOptions.Singleline
    | RegexOptions.CultureInvariant
    | RegexOptions.IgnorePatternWhitespace
    | RegexOptions.Compiled
    );
// Capture all Matches in the InputText
MatchCollection ms = regex.Matches(InputText);