How do I add exception handling in my code?

Question

I need help with this code. I need to do the following: 

Create an exception handling to throw an error if:

1) The number of integer in each row are not equal to each other for example: Matrix = [ 3 4; 9 8 1]should be: matrix = [ 3 4 2; 9 8 1]

2) the semicolon ";" that I use as a separator is replace by an invalid character such as: matrix = [ 3 4 2 # 9 8 1]

3)  The starting character for the matrix is not '[' or the ending character of the matrix is not ']'. For example, matrix = ] 1 2 3[     should be   matrix = [1 2 3]

This is my code:

This is from my main in which I create the string and call the class method.

string text = "A = [8 5 5 4; 2 6 5 3; 8 5 2 6]";

 this is my class:

 

 

public string[,] Matrix(string text)

{

   try

      {

         try

{

char[] splitOne = { '[', ']' };

char[] splitTwo = { ';' };

char[] splitThree = { ' ' };

words = text.Split(splitOne)[1]

.Split(splitTwo, StringSplitOptions.RemoveEmptyEntries)

.Select(x => x.Split(splitThree, StringSplitOptions.RemoveEmptyEntries))

.ToArray();

}

 

 if (!text.Contains(";")) { throw new Exception("Malformed separator'"); }

 

if (text.Split(';')[0].Replace(" ", "").Length != text.Split(';')[1].Replace(" ", "").Length)

{ throw new Exception("unbalanced matrix"); }

 

}

catch (Exception a)

{

      Console.WriteLine(a.Message);

}

}

      catch (Exception b)

{

      Console.WriteLine(b.Message);

                       }

      } 

 

 

string[,] matrix = new string[words.Length, words[0].Length];

for (int i = 0; i < words.Length; ++i)

{

            for (int j = 0; j < words[i].Length; ++j)

               {

                           matrix[i, j] = words[i][j];

               }

 }

                  for (int i = 0; i < matrix.GetLength(0); i++)

                     {

                        for (int j = 0; j < matrix.GetLength(1); j++)

                        {

                              Console.Write("{0} ", matrix[i, j]);

                        }

                              Console.WriteLine();

                        }

return matrix;

}

 

I got the separator part to work, But I need help on number 1. I don't know if that code is correct.