using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
string str = @"<h1>My Html</h1>
<div>
<p>bla bla bla</p>
<table>
<!-- table content -->
</table>
</div>";
string result = Regex.Replace(str, @"(?m)\n\s*(?=<)", "");
Console.WriteLine(result);
Console.ReadLine();
}
}
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