在长字符串中查找以[开始并以]结束的所有字符串部分

我有一个有趣的问题，我想找到一个最好的解决方案，我已经尽我最大的努力与regex。我想要的是找到所有的col_x值从这个字符串使用c#使用正则表达式或任何其他方法。

[col_5] is a central heating boiler manufacturer produce boilers under [col_6]
 brand name . Your selected [col_7] model name is a [col_6] [col_15] boiler.   
[col_6] [col_15] boiler [col_7] model [col_10] came in production untill 
[col_11].  [col_6] model product index number is [col_1] given by SEDBUK 
'Seasonal Efficiency of a Domestic Boiler in the UK'. [col_6] model have 
qualifier [col_8] and GCN  [col_9] 'Boiler Gas Council No'. [col_7] model 
source of heat for a boiler combustion is a [col_12].

期望的输出是一个数组

var data =["col_5","col_10","etc..."]

编辑

my attempt:

string text = "[col_1]cc[col_2]asdfsd[col_3]";
var matches = Regex.Matches(text, @"[[^@]*]");
var uniques = matches.Cast<Match>().Select(match => match.Value).ToList().Distinct();
    foreach(string m in uniques)
    {
        Console.WriteLine(m);
    }

string[] result = Regex.Matches(input, @"'[(col_'d+)']").
                            Cast<Match>().
                            Select(x => x.Groups[1].Value).
                            ToArray();

  string pattern = @"'[(col_'d+)']";
  MatchCollection matches = Regex.Matches(input, pattern);
  string[] results = matches.Cast<Match>().Select(x => x.Groups[1].Value).ToArray();

var myMessage =@"[col_5] is a central heating boiler..."; //etc.
var values = Enumerable.Range(1, 100)
             .Select(x => "[col_" + x + "]")
             .Where(x => myMessage.Contains(x))
             .ToList();