Read an array from standard input, ignoring brackets and commas

Question

The sample input to my code is:

{ 1, 2, 3, 4 }

I wish to ignore the curly brackets and commas, and read the numbers into an array.

Answer 1

Using Regex

An easy fix is to use C++11 regular expressions to simply replace all unwanted characters with whitespace and then tokenize the integers using streams as usual.

Let's say you've read the input into a string called s, e.g.

std::getline(std::cin, s);

Then you can simply read all the integers into a std::vector using these two lines:

std::istringstream ss{std::regex_replace(s, std::regex{R"(\{|\}|,)"}, " ")};
std::vector v{std::istream_iterator{ss}, std::istream_iterator{}};

Live Example