C# replacing a string

Question

I have one list with words and their replacing words, for example:

desk-->table etc.

So lets say if user write desk it will give result table but if user write Desk with capital D it will not do any change. I know how to ignore uppercase but then the world will be replaced with table where t is lowercase... I want the t to be uppercase. So if desk-->table and if Desk-->Table... How i can do that?

Answer 1

You could call the replace function a second time, the second time with the capital words.

For example:

string result = input.Replace ("desk", "table");
result = result.Replace ("Desk", "Table");

To get the first character of a string to uppercase is not very difficult. You could use this method:

string lower = "desk";
string upper = char.ToUpper(lower[0]) + lower.Substring(1);

Answer 2

You are saying that you have a list with words and their replacing words. So the data structure will be

Dictionary<string, string> dict = new Dictionary<string, string>();
dict.Add("desk","table");
dict.Add("Desk","Table"); 

If this is correct, then the following will work

var result = dict["Desk"];

But if you are maintaining the values in the below way,

Dictionary<string, string> dict = new Dictionary<string, string>();
dict.Add("desk","table"); 

then the solution may be

private void button1_Click(object sender, EventArgs e)
    {
        Dictionary<string, string> dict = new Dictionary<string, string>();
        dict.Add("desk","table");


        string input = "Desk";
        var dictValue = dict[input.ToLower()];
        var result = IsInitCap(input.Substring(0, 1)) 
                     ? System.Threading.Thread.CurrentThread.CurrentCulture.TextInfo.ToTitleCase(dictValue)
                     : dictValue;                

    }

    private bool IsInitCap(string str)
    {
        Match match = Regex.Match(str, @"^[A-Z]");
        return match.Success ? true : false;
    }

Hope this helps

Answer 3

You can use the below code to make the first letter of the input string to UpperCase,

str = str.First().ToString().ToUpper() + String.Join("", str.Skip(1));

Now in your case, use the Dictionary data structure to store data.

1. Store the input value as such (key)desk->table(value)

2. Now use the above code and make the first letter uppercase and store it (Desk->Table)

So you can now get the values as if desk-->table and if Desk-->Table.

This always fetches the value in time complexity O(1) by compromising the space complexity.