String Splitting in C++ (using find and substr)

String Splitting in C++

Hello guys,

you all have known the string splitting. Basically, string splitting is nothing but dividing the string based on a Delimiter or special character. 

For example, example@gmail.com by the delimiter looks like [example,gmail.com] 

use of string splitting is very broad as we can use this to tokenize thing in the web crawlers, data analysis in the data to extract useful things etc.

without wasting much time let's start splitting.

First of all create a schema for the c++ file.

#include <iostream>
#include <string>

using namespace std;
int main() {

 return 0;
 }

Now let's take a string that is to be split.
I took "codeincafeinweb".

take a delimiter, for example, I took "in".

and one more string variable for tokens.
string.find() method returns the starting position of the delimiter, if it founds nothing then it will return -1.
That is why we are using the while with terminating condition of -1.

string name = "codeincafeinweb";
// delimiter by which string is splitted
string delimiter = "in";
int pos;
string token = "";
// find method returns -1 if nothing found like the delimiter.
pos = name.find(delimiter);

now apply a while loop to check that we have found the delimiter every time or not, if not then exit out of the loop and last string, now or original string has the last part of the splitted string, that's why we are showing that last time.

while(pos != -1) {
 // this gives the substring from the requested position
 token = name.substr(0, pos);
 // printing the splitted string
 cout << token << endl;
 name.erase(0, pos + delimiter.length());
 pos = name.find(delimiter);
} 
token = name;
cout << token;

That's it for the program.

Let's put the whole program into a single piece.

#include <iostream>
#include <string>

using namespace std;

int main() {
 // string to be splitted 
 string name = "codeincafeinweb";
 // delimiter by which string is splitted
 string delimiter = "in";
 int pos;
 string token = "";
 // find method returns -1 if nothing found like the delimiter.
 pos = name.find(delimiter);
 while(pos != -1) {
  // this gives the substring from the requested position
  token = name.substr(0, pos);
  // printing the splitted string
  cout << token << endl;
  name.erase(0, pos + delimiter.length());
  pos = name.find(delimiter);
 } 
 token = name;
 cout << token;
 return 0;
}

sample run and output for this program is 

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