How to split string between different chars

You can use String.Split() method with params char[];

Returns a string array that contains the substrings in this instance that are delimited by elements of a specified Unicode character array.

string text = "the dog :is very# cute";
string str = text.Split(':', '#')[1]; // [1] means it selects second part of your what you split parts of your string. (Zero based)
Console.WriteLine(str);

Here is a DEMO.

You can use it any number of you want.

use this code

var varable = text.Split(':', '#')[1];

That's not really a split at all, so using Split would create a bunch of strings that you don't want to use. Simply get the index of the characters, and use SubString:

int startIndex = text.IndexOf(':');
int endIndex = test.IndexOf('#', startIndex);
string very = text.SubString(startIndex, endIndex - startIndex - 1);