C++ String Library - find_first_of


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Description

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

Declaration

Following is the declaration for std::string::find_first_of.

size_t find_first_of (const string& str, size_t pos = 0) const;

C++11

size_t find_first_of (const string& str, size_t pos = 0) const noexcept;

C++14

size_t find_first_of (const string& str, size_t pos = 0) const noexcept;

Parameters

  • str − It is a string object.

  • len − It is used to copy the characters.

  • pos − Position of the first character to be copied.

Return Value

none

Exceptions

if an exception is thrown, there are no changes in the string.

Example

In below example for std::string::find_first_of.

Live Demo
#include <iostream>
#include <string>
#include <cstddef>

int main () {
   std::string str ("It replaces 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;
}

The sample output should be like this −

It r*pl*c*s th* v*w*ls *n th*s s*nt*nc* by *st*r*sks.

string.htm

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