using System;
using System.Text.RegularExpressions;
public class Test
{
static void Main()
{
string text = "text1, text2,te\nxt3, text4\r\ntext5";
System.Console.WriteLine("text='{0}'", text);
string result = Regex.Replace(text, @"([^\r])\n", "$1");
System.Console.WriteLine("text='{0}'", result);
}
}
dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uVGV4dC5SZWd1bGFyRXhwcmVzc2lvbnM7CgpwdWJsaWMgY2xhc3MgVGVzdAp7CgogICAgc3RhdGljIHZvaWQgTWFpbigpCiAgICB7CiAgICAgICAgc3RyaW5nIHRleHQgPSAidGV4dDEsIHRleHQyLHRlXG54dDMsIHRleHQ0XHJcbnRleHQ1IjsKCiAgICAgICAgU3lzdGVtLkNvbnNvbGUuV3JpdGVMaW5lKCJ0ZXh0PSd7MH0nIiwgdGV4dCk7CgoKICAgICAgICBzdHJpbmcgcmVzdWx0ID0gUmVnZXguUmVwbGFjZSh0ZXh0LCBAIihbXlxyXSlcbiIsICIkMSIpOwoKICAgICAgICBTeXN0ZW0uQ29uc29sZS5Xcml0ZUxpbmUoInRleHQ9J3swfSciLCByZXN1bHQpOwogICAgfQp9CQkK