In this article we will discuss how to replace all occurrences of a sub string with new string in C++.
For example, we have a string i.e.
“Boost Library is simple C++ Library”
And we want replace all occurrences of ‘Lib’ with XXX. Let’s see the different methods to do it,
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Find & Replace all sub strings – using STL
#include <iostream>
#include <string>
void findAndReplaceAll(std::string & data, std::string toSearch, std::string replaceStr)
{
// Get the first occurrence
size_t pos = data.find(toSearch);
// Repeat till end is reached
while( pos != std::string::npos)
{
// Replace this occurrence of Sub String
data.replace(pos, toSearch.size(), replaceStr);
// Get the next occurrence from the current position
pos =data.find(toSearch, pos + replaceStr.size());
}
}
int main()
{
std::string data = "Boost Library is simple C++ Library";
std::cout<<data<<std::endl;
findAndReplaceAll(data, "Lib", "XXX");
std::cout<<data<<std::endl;
return 0;
}
Output:
Boost Library is simple C++ Library Boost XXXrary is simple C++ XXXrary
Find & Replace all sub strings – using Boost::replace_all
#include <iostream>
#include <string>
#include <boost/algorithm/string.hpp>
int main()
{
std::string data = "Boost Library is simple C++ Library";
std::cout<<data<<std::endl;
// Replace all occurrences of 'LIB' with 'XXX'
// Case Sensitive Version
boost::replace_all(data, "Lib", "XXX");
std::cout<<data<<std::endl;
}
Output:
Boost Library is simple C++ Library Boost XXXrary is simple C++ XXXrary
Find & Replace all Case Insensitive Sub Strings using Boost::ireplace_all
#include <iostream>
#include <string>
#include <boost/algorithm/string.hpp>
int main()
{
std::string data = "Boost Library is simple C++ Library";
std::cout<<data<<std::endl;
// Replace all occurrences of 'LIB' with 'XXX'
// Case Insensitive Version
boost::ireplace_all(data, "LIB", "XXX");
std::cout<<data<<std::endl;
}
Output:
Boost Library is simple C++ Library Boost XXXrary is simple C++ XXXrary
thanks for sharing tips. first post i read!
i hope can read all your tip in the next week ^^.
1st.
//with erase & insert
#include
using namespace std;
void replace_(string& str, string toSearch, string replaceWith)
{
int pos = str.find(toSearch);
while (pos != string::npos)
{
str.erase(pos, toSearch.length());
str.insert(pos, replaceWith);
pos = str.find(toSearch, pos + replaceWith.length());
}
}
int main()
{
string str = “Boost Library is simple C++ Library”;
replace_(str, “Lib”, “XXXY”);
cout<<str<<endl;
return 0;
}