I need to replace a string of the type T1.9 with the string unit19. The number of digits could vary e.g.T34.999 should become unit34999. Here is my progress:
std::regex e ("^(T\d+\.\d+)$");
std::string result (std::regex_replace(version, e, "") );
What should I write for format? Or is the approach to replace the string in one, no two, iterations, wrong?
You need to adjust the capturing groups in the pattern and use backreferences in the replacement pattern:
^T([0-9]+)[.]([0-9]+)$
and replace with unit$1$2.
See the regex demo
#include <iostream>
#include <regex>
using namespace std;
int main() {
std::vector<std::string> strings;
strings.push_back("T34.999");
strings.push_back("T1.9");
std::regex reg("^T([0-9]+)[.]([0-9]+)$");
for (size_t k = 0; k < strings.size(); k++)
{
std::cout << std::regex_replace(strings[k], reg, "unit$1$2") << std::endl;
}
return 0;
}
