find string
// string::find
#include <iostream> // std::cout
#include <string> // std::string
int main ()
{
std::string str ("There are two needles in this haystack with needles.");
std::string str2 ("needle");
// different member versions of find in the same order as above:
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';
// let's replace the first needle:
str.replace(str.find(str2),str2.length(),"preposition");
std::cout << str << '\n';
return 0;
}
word = 'geeks for geeks'
# returns first occurrence of Substring
result = word.find('geeks')
print ("Substring 'geeks' found at index:", result )
result = word.find('for')
print ("Substring 'for ' found at index:", result )
# How to use find()
if (word.find('pawan') != -1):
print ("Contains given substring ")
else:
print ("Doesn't contains given substring")