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

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Merged into ISO C++ The functionality described on this page was merged into the mainline ISO C++ standardas of 11/2018, see std::erase_if (since C++20) 
template< class CharT, class Traits, class Alloc, class Pred >
void erase_if( std::basic_string<CharT, Traits, Alloc>& c, Pred pred );
(library fundamentals TS v2)

Erases all elements that satisfy the predicate pred from the container. Equivalent to c.erase(std::remove_if(c.begin(), c.end(), pred), c.end());.

Parameters

c - container from which to erase
pred - predicate that determines which elements should be erased

Complexity

Linear.

Example

#include <experimental/string>
#include <iomanip>
#include <iostream>

int main()
{
    std::string data{"1337!p_C00L_<a-_HACKER_!@s_(!s#@_w^o%r*d#42"};
    std::cout << "Original string: " << std::quoted(data) << '\n';
    auto crack = [](auto O) { return '`' ^ ('`' & O); };
    std::experimental::erase_if(data, crack);
    std::cout << "After erase_if:  " << std::quoted(data) << '\n';
}

Output: 

Original string: "1337!p_C00L_<a-_HACKER_!@s_{!s#@_w^o%r*d#42"
After erase_if:  "password"

See also