#include<regex>
#include<string>

int main() {
    std::string text = "Our coordinates are (a=123, b=5432), and we have some values too";
    
    std::regex pattern("a=(\\d+), b=(\\d+)");
    std::smatch match;
    
    if(std::regex_search(text, match, pattern)) {
        std::string a = match[1];  // acquires value "123"
        std::string b = match[2];  // acquires value "5432"
    }

    return 0;
}