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Showing content from https://en.cppreference.com/w/cpp/language/../../cpp/header/../experimental/basic_string/erase.html below:

std::experimental::erase (std::basic_string) - cppreference.com

Erases all elements that compare equal to value from the container. Equivalent to c.erase(std::remove(c.begin(), c.end(), value), c.end());.

Linear.

#include <experimental/string>
#include <iostream>
 
int main()
{
    std::string data{"$$P$A$S$S$$W$O$R$$D$"};
    std::cout << data << '\n';
    auto crack{'$'};
    std::experimental::erase(data, crack);
    std::cout << data << '\n';
}

Output:

$$P$A$S$S$$W$O$R$$D$
PASSWORD

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