IT. Expert System.

Searches the string for the first character that matches any of the characters specified in its arguments.

Syntax:

find_first_of( const basic_string &str, size_type index = 0 );
 find_first_of( const char *str, size_type index = 0 );
 find_first_of( const char *str, size_type index, size_type num );
 find_first_of( char ch, size_type index = 0 );

Example:

#include        // std::cout
#include          // std::string
#include         // std::size_t

int main ()
{
  std::string str ("Please, replace the vowels in this sentence by asterisks.");
  std::size_t found = str.find_first_of("aeiou");
  while (found!=std::string::npos)
  {
    str[found]='*';
    found=str.find_first_of("aeiou",found+1);
  }

  std::cout << str << '\n';

  return 0;
}

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