How to make a Split for when there is a letter in the string?

Question

I’d like to make one string be divided with the .Split() every time there was a letter. Example:

To string: 97A96D112A109X115T114H122D118Y128

Would become a array with 9 values: { 97 96 112 109 115 114 122 118 128 }

How can I do that?

Code I have (to use as a basis):

string[] az = txt.Split(/*Parametros aqui*/);

Answer 1

Use the Split() to break using a array with all the characters that can be broken. To facilitate, although not the most performatic (but not exaggerated) can create a string and turn into a array of char with ToCharArray(). You can do it in one line. If you want maximum performance, create the array in hand.

If you need lower case also just include them. Check the documentation for options if you need specific break modes.

using static System.Console;
public class Program {
    public static void Main() {
        var partes = "97A96D112A109X115T114H122D118Y128".Split("ABCDEFGHIJKLMNOPQRSTUVXWYZ".ToCharArray());
        foreach (var item in partes) WriteLine(item); //só para confirmar que deu certo
    }
}

Behold working in the ideone. And in the .NET Fiddle. Also put on the Github for future reference.

Answer 2

Try it like this:

string alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
string[] az = txt.Split(alphabet.ToCharArray());

Answer 3

You could do that using the char.Isletter. would look like this:

string az= "97A96D112A109X115T114H122D118Y128";

string[] novaString;

foreach (char c in az)
{
    if(char.IsLetter(c)
    {
        string[] novaString = az.Split(c);
    }
}

That’s how you access it: novaString[0] novaString[1]

Answer 4

Another alternative is to use regular expressions (System.Text.RegularExpressions) through a pattern in the Regex search language to make the "Matches" (value matches) of only numbers and then use Linq (System.Linq) to get the result, in the case of a collection, cast a IEnumerable of the kind Match, that IEnumerable we take only the values we want in the 'value' property and then convert to an array of strings, from that array we use the method Join class String and then we use the Split. There’s actually no need for Join nor the Split and the code becomes even simpler. I leave the two options for comparison.

1) Sem Split:

// varias linhas
string value = "97A96D112A109X1X15T114H122D118Y128";
var matches = Regex.Matches(value, "[0-9]+");
var arrayOfNumbers = matches.Cast<Match>().Select(m => m.Value).ToArray();

// uma linha apenas
string[] arrayOfNumbers = Regex.Matches("97A96D112A109X1X15T114H122D118Y128", "[0-9]+")
.Cast<Match>().Select(m => m.Value).ToArray();

2) With Split:

string value = "97A96D112A109X1X15T114H122D118Y128";
var matches = Regex.Matches(value, "[0-9]+");
var arrayOfNumbers = String.Join("-", matches.Cast<Match>().Select(m => m.Value).ToArray()).Split('-');

Answer 5

You can use a list with the characters needed to split your array:

using System.Collections.Generic;

namespace SplitTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var text = "97A96D112A109X115T114H122D118Y128";
            var separatorList = new List<char>();

            // ASCII TABLE
            // 0X41 = A
            // 0X5A = Z

            for (int i = 0X41; i < 0X5B; i++)
            {
                separatorList.Add((char)i);
            }

            var result = text.Split(separatorList.ToArray());

        }
    }
}

Answer 6

In addition to what has been answered previously you can use regular expression 'Regex' with the replace function, replacing the unwanted characters, in this case replace with a '-' dash, then just use 'Split' with this character '-'.

 string txt = "97A96D112A109X115T114H122D118Y128";
 string[] az = Regex.Replace(txt, "[^0-9]", "-").Split('-');