Several methods for splitting strings in c sharp

Single character segmentation  
string   s="abcdeabcdeabcde";  
string[]   sArray=s.Split('c');  
foreach(string   i   in   sArray)  
Console.WriteLine(i.ToString());  
Output the following:  
ab  
deab  
deab  
de  


Multiple character segmentation  
string   s="abcdeabcdeabcde  
string[]   sArray1=s.Split(new   char[3]{'c','d','e'});  
foreach(string   i   in   sArray1)  
Console.WriteLine(i.ToString());  
The following results can be output:  
ab  
ab  
ab  

Multiple character segmentation (regular expression)  
string   content="agcsmallmacsmallgggsmallytx";  
string[]resultString=Regex.Split(content,"small",RegexOptions.IgnoreCase)  
foreach(string   i   in   resultString)  
Console.WriteLine(i.ToString());  
Output the following result :agc  
mac  
ggg  
ytx