Question

How to remove all non-ASCII characters from a string in C++

Answer 1

#include <iostream>
#include <string>
#include <algorithm> // remove_if
 
int main() {
    std::string input = "©€ABC£µ¥xyz!® 123 こんにちは";
     
    // Remove non-ASCII characters
    input.erase(std::remove_if(input.begin(), input.end(), [](unsigned char ch) {
        return ch > 127; // ASCII characters are in the range 0-127
    }), input.end());
    
    std::cout << input;        
}
 
 
/*
run:
 
ABCxyz! 123 
 
*/

 

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Answer 2

#include <iostream>
#include <string>
#include <algorithm> // copy_if

int main() {
    std::string input = "©€ABC£µ¥xyz!® 123 こんにちは";
    std::string result;
    
    // Remove non-ASCII characters
    copy_if(begin(input), end(input), back_inserter(result),
         [](const auto c) { return static_cast<unsigned char>(c) <= 0x7F; });
         
    std::cout << result;
    
}


/*
run:

ABCxyz! 123 

*/

 

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