using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
String input = @"i General Biology i
i General Biology
General Biology i";
String result = Regex.Replace(input, @"(?im)^[a-z0-9]\s+|\s+[a-z0-9]$", "");
Console.WriteLine(result);
}
}
dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uVGV4dC5SZWd1bGFyRXhwcmVzc2lvbnM7CgoKcHVibGljIGNsYXNzIFRlc3QKewoJcHVibGljIHN0YXRpYyB2b2lkIE1haW4oKQoJewoKICAgICBTdHJpbmcgaW5wdXQgPSBAImkgR2VuZXJhbCBCaW9sb2d5IGkKaSBHZW5lcmFsIEJpb2xvZ3kKR2VuZXJhbCBCaW9sb2d5IGkiOwoKICAgICBTdHJpbmcgcmVzdWx0ID0gUmVnZXguUmVwbGFjZShpbnB1dCwgQCIoP2ltKV5bYS16MC05XVxzK3xccytbYS16MC05XSQiLCAiIik7CiAgICAgQ29uc29sZS5Xcml0ZUxpbmUocmVzdWx0KTsKCgl9Cn0=