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++ 30:is:  a high-level, general-purpose (programming) language.";
     
    std::cout << remove_all_non_alphanumeric_characters(str);
}
 
  
  
/*
run:
  
C30isahighlevelgeneralpurposeprogramminglanguage
  
*/

 

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