How to remove lowercase on a textbox?

Question

I\'m trying to remove the lower case letters on a TextBox..

For example, short alpha code representing the insurance (e.g., \'BCBS\' for \'Blue Cross B

Answer 1

Rather than matching on all capitals, I think the specification would require matching the first character from all the words. This would allow for inconsitent input but still be reliable in the long run. For this reason, I suggest using the following code. It uses an aggregate on each Match from the Regex object and appends the value to a string object called output.

string input = "Blue Cross BLUE shield 12356";
Regex regex = new Regex("\\b\\w");
string output = regex.Matches(input).Cast<Match>().Aggregate("", (current, match) => current + match.Value);
Console.WriteLine(output.ToUpper()); // outputs BCBS1

Answer 2

string Code = Regex.Replace(txtDesc.text, "[a-z]", "");

Answer 3

I´d map the value to your abbreviation in a dictionary like:

Dictionary<string, string> valueMap = new Dictionary<string, string>();
valueMap.Add("Blue Cross Blue Shield", "BCBS");

string Code = "";
if(valueMap.ContainsKey(txtDesc.Text))
  Code = valueMap[txtDesc.Text];
else
  // Handle

But if you still want the functionality you mention use linq:

string newString = new string(txtDesc.Text.Where(c => char.IsUpper(c).ToArray());

Answer 4

Without Regex:

string input = "Blue Cross Blue Shield";
string output = new string(input.Where(Char.IsUpper).ToArray());
Response.Write(output);

Answer 5

string caps = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

string.Join("",
   "Blue Cross Blue Shield".Select(c => caps.IndexOf(c) > -1 ? c.ToString() : "")
                           .ToArray());