Split string by (') and Spaces but keep any space character between two consecutive (')

Something like this should get he job done.. that is if you don't mind your head exploding from a regex.. p.s this should cover your weird extra case :) Oh and just so I make sure I credit the right people I got the regex for this from https://stackoverflow.com/a/51432792/5963888

var str = "1 7871.6 'LIQ' 'WCT' 'GOR' \"THP\" ' ' 'LIQ WCT GOR' FIELD BHP /";
var regex = new System.Text.RegularExpressions.Regex("([\"'])((?:\\\\1|(?:(?!\\1)).)*)(\\1)");
var match = regex.Matches(str)
    .Select(e => e.Groups)
    .Select( e => e[2].Value)
    .SelectMany( e =>
    {
        if(!(e.Trim() == String.Empty))
        {
            return e.Split();
        }
        return new[] { e };
    });
System.Console.WriteLine(String.Join(Environment.NewLine, match));

Here is some code that does the trick

    string str = "1 7871.6 'LIQ' 'WCT' 'GOR' 'THP' ' ' FIELD BHP /";


    string replaceToken  = "someValueThatYouChose";
    str = str.Replace(" ' ' ", $" {replaceToken} ");
    str = str.Replace("'", "");
    string[] splitValues = str.Split(" ");
    for (int i = 0; i < splitValues.Length; i++)
    {
        if(splitValues[i] == replaceToken){
            splitValues[i] = " ";
        }
    }
    // Here is your output
    foreach (var value in splitValues)
    {
        Console.WriteLine(value);
    }