Question

Suppose, I have the following string:

string temp = "some string contains text which contains demo";
string result = RemainingString(temp, 12, 8); // string, startIndex, length

The result string I need should look as follows:

some string text which contains demo

Note, that the word contains is removed from first place only.

Update: I personally want to achieve this using regular expression explicitly.

Answer 1

Here’s a solution using regular expressions:

public string RemainingString(string str, int start, int length)
{
    return Regex.Replace(str, "^(.{" + start+ "})(?:.{" + length + "})(.*)$", "$1$2");
}