using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
string nameString = @"C:\Users\Documents\Development\testing\11.0.25.10\W_11052_0_X.pts";
string pathPrefix = Regex.Match(nameString, @"^(.*[\\])").Groups[1].Value;
Console.WriteLine(pathPrefix);
}
}
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