How to get substring from string with whitespace in C#-CodePudding

Suppose I have string s as given below , I want to have return substring with space like 123 456 7

string s = "123  456  789    012  7892";

string sa = Regex.Replace(s, @"\s", "").Substring(0, 7);

//string sa = "123456"; -- getting this after substring 
// sa = "123 456 7" -- expected this after substring

CodePudding user response：

You can simply do it using Split and Join methods

string s = "123  456  789    012  7892";

var splitted = s.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
var joined = string.Join(' ', splitted);
var subString = joined.Substring(0, 9);  // : 123 456 7

CodePudding user response：

you can use Regex.Replace(s, @"\s ", " ") for replace multiple spaces in a string with one space

string s = "123  456  789    012  7892";
string newS = Regex.Replace(s, @"\s ", " ");
Console.WriteLine(newS.Substring(0, 7 2)); // 2 for spaces

result: "123 456 7"