Match a single character in a DataView RowFilter?

Question

I'm wondering if there is any possible way of applying a RowFilter on a DataView which provides single character matching?

e.g. DataView.RowFilter = "SOME_COL like 'A_BCD%';

where the underscore represents a single-character match in Oracle SQL, and % is a wildcard of 0 or more characters.

Apparently RowFilter only supports wildcards (* or %) at the beginning or end of the matching expression. The only other idea I've had is to iterate through the rows and delete ones that don't match a regular expression, but this is not ideal.

Any help or ideas would be greatly appreciated! Thanks

Answer 1

You could use Linq to Datasets to do this

class Program
{

    static void Main(string[] args)
    {
        DataTable dt = new DataTable("test");
        dt.Columns.Add("SOME_COL", typeof(string));

        dt.Rows.Add("AABCDEFG");
        dt.Rows.Add("AZBCDEFG");
        dt.Rows.Add("AZZBCDEFG");
        dt.Rows.Add("ABC");

        Regex r = new Regex("A\\wBCDE");

        DataView dv 
           = (from t in dt.AsEnumerable()
              where r.IsMatch(t.Field<string>("SOME_COL"))
             select t).AsDataView();

        foreach(DataRowView row in dv)
        {
            Console.WriteLine(row[0]);
        }


    }


}

outputs

AABCDEFG
AZBCDEFG
Press any key to continue . . .

Answer 2

Alternatively,

DataView.RowFilter = "Substring(SOME_COL, 1, 1) = 'A' and Substring(SOME_COL, 3, 3) = 'BCD';"