C++ String Library - replace

Description

It replaces the portion of the string that begins at character pos and spans len characters.

Declaration

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

 string& replace (size_t pos, size_t len, const string& str, size_t subpos, size_t sublen); 

C++11

 string& replace (size_t pos,size_t len,const string& str, size_t subpos, size_t sublen); 

C++14

 string& replace (size_t pos,size_t len,const string& str, size_t subpos, size_t sublen = npos); 

Parameters

• pos − It is an insertion point.

• str − It is a string object.

• len − It contains information about number of characters to erase.

Return Value

It returns *this.

Exceptions

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

Example

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

 #include <iostream> #include <string> int main () { std::string base="this is a test string."; std::string str2="n example"; std::string str3="sample phrase"; std::string str4="useful."; std::string str=base; str.replace(9,5,str2); str.replace(19,6,str3,7,6); str.replace(8,10,"just a"); str.replace(8,6,"a shorty",7); str.replace(22,1,3,'!'); str.replace(str.begin(),str.end()-3,str3); str.replace(str.begin(),str.begin()+6,"replace"); str.replace(str.begin()+8,str.begin()+14,"is coolness",7); str.replace(str.begin()+12,str.end()-4,4,'o'); str.replace(str.begin()+11,str.end(),str4.begin(),str4.end()); std::cout << str << '\n'; return 0; } 

The sample output should be like this −

 replace is useful.