Example of String replace()
C++
// CPP code to demonstrate std::string::replace() #include <iostream> using namespace std; // Function for demonstration void replaceDemo(string s1, string s2, string s3, string s4) { // Using positions cout << "Using positions:" << "\n" ; // Replaces 7 characters from 0th index by s2 s1.replace(0, 7, s2); cout << s1 << endl; // Replaces 3 characters from 0th index with "Hello" s4.replace(0, 3, "Hello " ); cout << s4 << endl; // Replaces 5 characters from 6th index of s4 with // 5 characters from 0th of s3 s4.replace(6, 5, s3, 0, 5); cout << s4 << endl; // Replaces 5 characters from 6th index of s4 with // 6 characters from string "to all" s4.replace(6, 5, "to all" , 6); cout << s4 << endl; // Replaces 1 character from 12th index of s4 with // 3 copies of '!' s4.replace(12, 1, 3, '!' ); cout << s4 << endl; // Using iterators cout << "\nUsing iterators:" << "\n" ; // Replaces whole s2 string with s3 s2.replace(s2.begin(), s2.end(), s3); cout << s2 << "\n" ; // Replaces 13 characters from begin of s1 with string // "Example" s1.replace(s1.begin(), s1.begin() + 13, "Example" ); cout << s1 << "\n" ; // Replace last 7 characters of s4 with first 12 // characters of the string "geeks from- here" s4.replace(s4.end() - 7, s4.end(), "geeks from- here" , 12); cout << s4 << "\n" ; // Replaces last character with complete s2 string from // s2.begin() till s2.end() s4.replace(s4.end() - 1, s4.end(), s2.begin(), s2.end()); cout << s4 << "\n" ; // Replaces portion of string s4 starting from 5 // characters from s4.begin() to 15 characters from // s4.begin() with 2 occurrences of ',' s4.replace(s4.begin() + 5, s4.begin() + 15, 2, ',' ); cout << s4 << "\n" ; } // Driver code int main() { string s1 = "Example of replace" ; string s2 = "Demonstration" ; string s3 = "w3wiki" ; string s4 = "HeyWorld !" ; replaceDemo(s1, s2, s3, s4); return 0; } |
Output
Using positions: Demonstration of replace Hello World ! Hello Geeks ! Hello to all ! Hello to all!!!! Using iterators: w3wiki Example of replace Hello to geeks from- Hello to geeks from-w3wiki Hello,,from-w3wiki
Related Article : std::string::replace_copy(), std::string::replace_copy_if
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std::string::replace() in C++
The string replace() function in C++ replaces each element in the part of the string in the range [first, last). It is defined inside the std::string class in C++ as a member function to provide replace functionality.