using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(([^\n\r.]*).*)(?:(?:\r?\n|\r)\2.*)*";
string substitution = @"\1";
string input = @"This is test string for my app. d
This is test string for my app.
This is test string for my app. abcd
This is test string for my app.
This is test string for my app.
This is test string for my app.
This is test string for my app. d
This is test string for my app.
This is test string for my app.
This is another string.";
RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnoreCase;
Regex regex = new Regex(pattern, options);
string result = regex.Replace(input, substitution);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx