How to delete part of string from specific word?

Question

Below is my sql query :

select * from Table where col1 = @param1 and col2 = @param2

Now I want to delete everything from where clause so expected output is like below :

select * from Table;

Code:

string str = "select * from Table where col1 = @param1 and col2 = @param2";

var str = sqlQuery.Replace("where", ""); // select * from Table col1 = @param1 and col2 = @param2

Answer 1

One way would be to work with IndexOf and Substring .

var sql = "select* from Table where col1 = @param1 and col2 = @param2";
var index = sql.IndexOf("where", StringComparison.OrdinalIgnoreCase);
var newSql = sql.Substring(0, index);

You could use Trim as well to remove the white space at the end. This would look like.

var newSql = sql.Substring(0, index).Trim();

Answer 2

I created below extension method with the help of answer provided by @Mighty Badaboom.

 static public string Foo(this string original,string wordToFind, StringComparison stringComparision = StringComparison.OrdinalIgnoreCase)
        {
            var index = original.IndexOf("where", stringComparision);
            return original.Substring(0, index).Trim();
        }

string newSql = Foo(str, "where", StringComparison.OrdinalIgnoreCase);