using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
var content = "test1\n\nabcdocean123 \n\n\ntest2\ntest3";
content = Regex.Replace(content, @"ocean.*", "$&water");
Console.WriteLine(content);
}
}
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