Question

How can i get the occurrences count of a Word in a database text field With LINQ ?

Keyword token sample : ASP.NET

EDIT 4 :

Database Records :

Record 1 : [TextField] = “Blah blah blah ASP.NET bli bli bli ASP.NET blu ASP.NET yop yop ASP.NET“

Record 2 : [TextField] = “Blah blah blah bli bli bli blu ASP.NET yop yop ASP.NET“

Record 3 : [TextField] = “Blah ASP.NET blah ASP.NET blah ASP.NET bli ASP.NET bli bli ASP.NET blu ASP.NET yop yop ASP.NET“

So

Record 1 Contains 4 occurrence of “ASP.NET” keyword

Record 2 Contains 2 occurrence of “ASP.NET” keyword

Record 3 Contains 7 occurrence of “ASP.NET” keyword

Collection Extraction IList < RecordModel > (ordered by word count descending)

• Record 3
• Record 1
• Record 2

LinqToSQL should be the best, but LinqToObject too 🙂

NB : No issue about the “.” of ASP.NET keyword (this is not the goal if this question)

Answer 1

A regex handles this nicely. You can use the \b metacharacter to anchor the word boundary, and escape the keyword to avoid unintended use of special regex characters. It also handles the cases of trailing periods, commas, etc.

string[] records =
{
    "foo ASP.NET bar", "foo bar",
    "foo ASP.NET? bar ASP.NET",
    "ASP.NET foo ASP.NET! bar ASP.NET",
    "ASP.NET, ASP.NET ASP.NET, ASP.NET"
};
string keyword = "ASP.NET";
string pattern = @"\b" + Regex.Escape(keyword) + @"\b";
var query = records.Select((t, i) => new
            {
                Index = i,
                Text = t,
                Count = Regex.Matches(t, pattern).Count
            })
            .OrderByDescending(item => item.Count);

foreach (var item in query)
{
    Console.WriteLine("Record {0}: {1} occurrences - {2}",
        item.Index, item.Count, item.Text);
}

Voila! 🙂