find substring c++ code example
Example 1: c++ check substring
if (s1.find(s2) != std::string::npos) {
std::cout << "found!" << '\n';
}
Example 2: find all occurrences of a substring in a string c++
#include <string>
#include <iostream>
using namespace std;
int main()
{
string s("hello hello");
int count = 0;
size_t nPos = s.find("hello", 0);
while(nPos != string::npos)
{
count++;
nPos = s.find("hello", nPos + 1);
}
cout << count;
};
Example 3: c++ string contains
if (string1.find(string2) != std::string::npos) {
std::cout << "found!" << '\n';
}
Example 4: std string find character c++
#include <iostream>
#include <string>
int main ()
{
std::string str ("There are two needles in this haystack with needles.");
std::string str2 ("needle");
std::size_t found = str.find(str2);
if (found!=std::string::npos)
std::cout << "first 'needle' found at: " << found << '\n';
found=str.find("needles are small",found+1,6);
if (found!=std::string::npos)
std::cout << "second 'needle' found at: " << found << '\n';
found=str.find("haystack");
if (found!=std::string::npos)
std::cout << "'haystack' also found at: " << found << '\n';
found=str.find('.');
if (found!=std::string::npos)
std::cout << "Period found at: " << found << '\n';
str.replace(str.find(str2),str2.length(),"preposition");
std::cout << str << '\n';
return 0;
}
Example 5: find substring in string c++
std::string parentstring = "Hello Agnosticdev, I love Tutorials";
std::string substring = "Agnosticdev";
auto index = parentstring.find(substring);
Example 6: find in string c++
size_t find (const string& str, size_t pos = 0) const;