Question

Given a string, I want to retrieve a string that is in between the quotation marks, and that is fully capitalized.

For example, if a string of

oqr”awr”q q”ASRQ” asd “qIKQWIR”

has been entered, the regex would only evaluate “ASRQ” as matching string.

What is the best way to approach this?

Edit: Forgot to mention the string takes a numeric input as well I.E: “IO8917AS” is a valid input

Answer 1

EDIT: If you actually want “one or more characters, and none of the characters is a lower-case letter” then you probably want:

Regex regex = new Regex("\"\\P{Ll}+\"");

That will then allow digits as well… and punctuation. If you want to allow digits and upper case letters but nothing else, you can use:

Regex regex = new Regex("\"[\\p{Lu}\\d]+\"");

Or in verbatim string literal form (makes the quotes more confusing, but the backslashes less so):

Regex regex = new Regex(@"""[\p{Lu}\d]+""");

---

Original answer (before digits were required)

Sounds like you just want (within the pattern)

 "[A-Z]*"

So something like:

Regex regex = new Regex("\"[A-Z]*\"");

Or for full Unicode support, use the Lu Unicode character category:

Regex regex = new Regex("\"\\p{Lu}*\"");

EDIT: As noted, if you don’t want to match an empty string in quotes (which is still “a string where everything is upper case”) then use + instead of *, e.g.

Regex regex = new Regex("\"\\p{Lu}+\");

Short but complete example of finding and displaying the first match:

using System;
using System.Text.RegularExpressions;

class Program
{    
    public static void Main()
    {
        Regex regex = new Regex("\"\\p{Lu}+\"");
        string text = "oqr\"awr\"q q\"ASRQ\" asd \"qIKQWIR\"";

        Match match = regex.Match(text);
        Console.WriteLine(match.Success); // True
        Console.WriteLine(match.Value);   // "ASRQ"
    }    
}