Question

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

Answer 1

#include <iostream>
#include <string>
#include <algorithm>

std::string remove_all_non_alphanumeric_characters(std::string str) {
    str.erase(std::remove_if(str.begin(), str.end(), [](unsigned char ch){ return !std::isalnum(ch); }), str.end());
    
    return str;
}

int main() {
    std::string str = "C++ :is: a high-level, general-purpose (programming) language.";
    
    std::cout << remove_all_non_alphanumeric_characters(str);
}

 
 
 
/*
run:
 
Cisahighlevelgeneralpurposeprogramminglanguage
 
*/

 

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