Question

How to find the first occurrence of a pattern in a string from some starting position in C++

Answer 1

#include <iostream>
#include <string>
 
int main() {
    std::string str = "abcdefgaaahijklaaaamnopqaaaaarst";
    std::string pattern = "aaa";
    size_t startPosition = 11; // Starting position to search from
 
    // Find the first occurrence of the pattern starting from the given position
    size_t foundPosition = str.find(pattern, startPosition);
 
    if (foundPosition != std::string::npos) {
        std::cout << "Pattern found at position: " << foundPosition << std::endl;
    } else {
        std::cout << "Pattern not found!" << std::endl;
    }
}



/*
run:

Pattern found at position: 15

*/

 

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