How do I extract text from sentence based on codition

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C#3.5

Please find below for more details.

I have a text with me ""1200005 # 28102016_0612 Inv.ACHExtractDetail POC.DiscountDetail Scanner Test1" & also a list of keyword

keywords.Add(new KeywordCTIBO() { Keyword = "Scanner" });
          keywords.Add(new KeywordCTIBO() { Keyword = "Inv.ACHExtractDetail" });
          keywords.Add(new KeywordCTIBO() { Keyword = "POC.DiscountDetail" });

What i require is i need to extract "Inv.ACHExtractDetail" from text since it is present in the list. What i mean is the first occurrence of keyword from text if and only if it exist in the list.

Below code works fine but i am looking much better if possible without using loops.

List<KeywordCTIBO> keywords = new List<KeywordCTIBO>();
           KeywordCTIBO matchedKeyword = null;
           keywords.Add(new KeywordCTIBO() { Keyword = "Scanner" });
           keywords.Add(new KeywordCTIBO() { Keyword = "Inv.ACHExtractDetail" });
           keywords.Add(new KeywordCTIBO() { Keyword = "POC.DiscountDetail" });

           string text = "1200005 # 28102016_0612 Inv.ACHExtractDetail POC.DiscountDetail Scanner Test1";
           //var matchedKeyWords = keywords.Where(f => text.ToLower().Split(',', ' ', ';').Contains(f.Keyword.ToLower())).Select(p => new { KeyWordBO = p, Index = text.ToLower().IndexOf(p.Keyword.ToLower()) });
           //string[] arr = text.ToLower().Split(',', ' ', ';');
           string [] arr = text.ToLower().Split(',', ' ', ';');
           string s = string.Empty;
           foreach(var r in arr){
               var matchedKeyWords = keywords.Where(f => r.Contains(f.Keyword.ToLower())).Select(p => new { KeyWordBO = p, Index = text.ToLower().IndexOf(p.Keyword.ToLower()) });
               foreach (var f in matchedKeyWords)
               {
                   s = f.KeyWordBO.Keyword;
               }
           }
       }
       public class KeywordCTIBO
       {
           public string Keyword { get; set; }
       }

What I have tried:

List<KeywordCTIBO> keywords = new List<KeywordCTIBO>();
            KeywordCTIBO matchedKeyword = null;
            keywords.Add(new KeywordCTIBO() { Keyword = "Scanner" });
            keywords.Add(new KeywordCTIBO() { Keyword = "Inv.ACHExtractDetail" });
            keywords.Add(new KeywordCTIBO() { Keyword = "POC.DiscountDetail" });
          
            string text = "1200005 # 28102016_0612 Inv.ACHExtractDetail POC.DiscountDetail Scanner Test1";
            //var matchedKeyWords = keywords.Where(f => text.ToLower().Split(',', ' ', ';').Contains(f.Keyword.ToLower())).Select(p => new { KeyWordBO = p, Index = text.ToLower().IndexOf(p.Keyword.ToLower()) });
            //string[] arr = text.ToLower().Split(',', ' ', ';');
            string [] arr = text.ToLower().Split(',', ' ', ';');
            string s = string.Empty;
            foreach(var r in arr){
                var matchedKeyWords = keywords.Where(f => r.Contains(f.Keyword.ToLower())).Select(p => new { KeyWordBO = p, Index = text.ToLower().IndexOf(p.Keyword.ToLower()) });
                foreach (var f in matchedKeyWords)
                {
                    s = f.KeyWordBO.Keyword;
                }
            }
        }
        public class KeywordCTIBO
        {
            public string Keyword { get; set; }
        }
        }