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std::string::replace() in C++ - GeeksforGeeks

Last Updated : 22 Oct, 2024

The string::replace() function in C++ is used to replace a single or multiple characters from a given index. It is the member function of std::string class. In this article, we will learn how to use the string::replace() function in our C++ program.

The string::replace() function provides 6 different overloads for different purposes:

str1.replace(pos, n, m, c) // Replace with character
str1.replace(pos, n, str2) // Replace with string
str1.replace(pos1, n, str2, pos2,m) // Replace with substring
str1.replace(first, last, n, c); // Replace Character
str1.replace(first, last, str2) // Replace String
str1.replace (first, last, str2_first, str2_last); // Replace Substring

These overloads provide different ways to replace characters in a string using string::replace method as given below:

We can use to replace some part of string with another string or any other character by specifying the indexes.

The string::replace() method can be used to replace the multiple characters with single repeated character.

Syntax

str1.replace(pos, n, m, c)

Parameters

• str1: String in which we have to replace the multiple characters.
• pos: Index to the position in str1 where we have to start replacing the characters.
• n: Number of characters which we have to replace.
• m: Number of times we have to repeat the single character.
• c: Character by which we have to replace.

Return Value

• It returns the original string after replacing the multiple characters with single repeated character.

Example

// C++ Program to show, how to use
// string::replace() for replacing the
// multiple characters with single repeated
// character
#include <bits/stdc++.h>
using namespace std;

int main() {
    string str = "Hey World";

    // Replaces 3 character from 0th index of
    // str with 3 copies of '!'
    str.replace(0, 3, 3, '!');

    cout << str << endl;

    return 0;
}

The string::replace() method can also be used to replace the multiple characters with a string.

Syntax

str1.replace(pos, n, str2)

Parameters

• str1: String in which we have to replace.
• pos: Index to the position in str1 where we have to start replacing the characters.
• n: Number of characters which we have to replace.
• str2: String by which we have to replace the characters.

Return Value

• It returns the original string after replacing the multiple characters by another string.

Example

// C++ Program to show, how to use
// string::replace() for replacing the
// multiple characters from another string
#include <bits/stdc++.h>
using namespace std;

int main() {
    string str1 = "Hey World";
    string str2 = "Hello";

    // Replaces 3 characters from 0th
    // index by str2
    str1.replace(0, 3, str2);

    cout << str1 << endl;

    return 0;
}

The string::replace() method can also be used to replace the multiple characters with a part of the given string.

Syntax

str1.replace(pos1, n, str2, pos2,m)

Parameters

• str1: The string in which we have to replace.
• pos1: Index to the position in str1 where we have to start replacing the characters.
• n: Number of characters which we have to replace.
• str2: String by which we have to replace the characters.
• pos2: Starting index of substring which we have to replace with multiple characters.
• m: Numbers of the character in the substring by which we have to replace.

Return Value

• It returns the original string after replacing the multiple characters by another substring.

Example

// C++ Program to show, how to use
// string::replace() for replacing the
// multiple characters from another substring
#include <bits/stdc++.h>
using namespace std;

int main() {
    string str1 = "Hello Geeks";
    string str2 = "Hey World";

    // Replaces 5 characters from 6th index
    // of str1 with 5 characters from 4th of str2
    str1.replace(6, 5, str2, 4, 5);

    cout << str1 << endl;

    return 0;
}

We can use to replace some part of string with another string or any other character by using the iterators.

The string::replace() method can be used to replace the multiple characters with a single repeated character.

Syntax

str1.replace(first, last, n, c);

Parameters

• str1: The string in which we have to replace the multiple characters.
• first: Iterator pointing to the starting position of str1 from where we have to replace the multiple characters.
• last: Iterator pointing to the position just after the last element up to which we have to replace.
• n: Number of single repeated character by which we have to replace.
• c: Character by which we have to replace.

Return Value

• It return the original string after replacing the multiple characters with single repeated character.

Example

// C++ Program to show, how to use
// string::replace() for replacing the
// multiple characters with single repeated
// character
#include <bits/stdc++.h>
using namespace std;

int main() {
    string str = "Hey World";

    // Defining the range
    auto first = str.begin();
    auto last = str.begin() + 3;

    // Replaces firts 3 character of
    // str with 3 copies of '!'
    str.replace(first, last, 3, '!');

    cout << str << endl;

    return 0;
}

The string::replace() method can also be used to replace the multiple characters with a string.

Syntax

str1.replace(first, last, str2)

Parameters

• str1: The string in which we have to replace the multiple characters.
• first: Iterator pointing to the starting position of str1 from where we have to replace the multiple characters.
• last: Iterator pointing to the position just after the last element up to which we have to replace.
• str2: String by which we have to replace the characters.

Return Value

• It return the original string after replacing the multiple characters by another string.

Example

// C++ Program to show, how to use
// string::replace() for replacing the
// multiple characters from another string
#include <bits/stdc++.h>
using namespace std;

int main() {
    string str1 = "Hey World";
    string str2 = "Hello World";

    // Defining the range
    auto first = str1.begin();
    auto last = str1.end();

    // Replaces the whole string str1 by str2
    str1.replace(first, last, str2);

    cout << str1 << endl;

    return 0;
}

The string::replace() method can also be used to replace the multiple characters with a substring.

Syntax

str1.replace(first, last, str2_first, str2_last)

Parameters

• str1: The string in which we have to replace the multiple characters.
• first: Iterator pointing to the starting position of str1 from where we have to replace.
• last: Iterator pointing to the position just after the last element up to which we have to replace.
• str2_first: Iterator pointing to the starting position of substring by which we have to replace.
• str2_last: Iterator pointing to the position just after the last element of the substring.

Return Value

• It returns the original string after replacing the multiple characters by another substring.

Example

// C++ Program to show, how to use
// string::replace() for replacing the
// multiple characters from another substring
#include <bits/stdc++.h>
using namespace std;

int main() {
    string str1 = "Hello Geeks";
    string str2 = "Hey World";

    // Defining the range
    auto first = str1.begin() + 6;
    auto last = str1.end();
    auto str2_first = str2.begin() + 4;
    auto str2_last = str2.end();

    // Replace the last 5 characters of str1
    // by last 5 characters of str2
    str1.replace(first, last, str2_first,
                 str2_last);

    cout << str1 << endl;

    return 0;
}

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