Method UnescapeAllUpper

csharp/src/Fory/MetaString.cs:515–533

(string input)

    }

    private static string UnescapeAllUpper(string input)
    {
        StringBuilder sb = new(input.Length);
        for (int i = 0; i < input.Length; i++)
        {
            char c = input[i];
            if (c == '|' && i + 1 < input.Length)
            {
                i++;
                sb.Append(char.ToUpperInvariant(input[i]));
            }
            else
            {
                sb.Append(c);
            }
        }

        return sb.ToString();
    }
}