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Implement search-and-replace for string objects.
#include <iostream>
#include <string>
using namespace std;
bool search_and_replace(string &str, const string &oldsubstr,const string &newsubstr);
int main(){
string str = "This is a test. So is this.";
while(search_and_replace(str, "is", "was"))
cout << str << endl;
cout << endl;
string oldstr("So");
string newstr("So too");
cout << "Replace "So" with "So too"" << endl;
search_and_replace(str, oldstr, newstr);
cout << str << endl;
return 0;
}
bool search_and_replace(string &str, const string &oldsubstr, const string &newsubstr) {
string::size_type startidx;
startidx = str.find(oldsubstr);
if(startidx != string::npos) {
str.replace(startidx, oldsubstr.size(), newsubstr);
return true;
}
return false;
}Replace all spaces with period
#include <iostream>
using std::cout;
using std::endl;
#include <string>
using std::string;
int main()
{
string string1( "abc edfgh ijk lmno pqr stu vw xyz" );
cout << "Original string:\n" << string1 << endl << endl;
int position = string1.find( " " ); // find first space
//
while ( position != string::npos )
{
string1.replace( position, 1, "." );
position = string1.find( " ", position + 1 );
}
cout << string1 << "\n\nAfter second replacement:\n";
return 0;
}Original string:
abc edfgh ijk lmno pqr stu vw xyz
abc.edfgh.ijk.lmno.pqr.stu.vw.xyz
After second replacement:
Replace one word with another word
#include <iostream>
#include <string>
#include <cctype>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
string strA("This is a test.");
// Create an iterator to a string.
string::iterator itr;
// Now, replace "bigger" with "larger".
cout << "Replace bigger with larger.\n";
itr = find(strA.begin(), strA.end(), "b");
strA.replace(itr, itr+6, "larger");
cout << strA << "\n\n";
return 0;
}Replacing Characters in Strings: equivalent of strnset()
#include <iostream>
#include <string>
using namespace std;
int main( )
{
string credit_card( "4578 9906 512 6661" );
cout << "Credit card number: " << credit_card;
// equivalent of strnset()
credit_card.replace( 0, credit_card.length()-4,credit_card.length()-4, "*" );
cout << "\nSecure display of credit card number: " << credit_card;
}Replacing Characters in Strings: equivalent of strset()
#include <iostream>
#include <string>
using namespace std;
int main( )
{
string credit_card( "4578 9906 512 6661" );
cout << "Credit card number: " << credit_card;
// equivalent of strset()
credit_card.assign( credit_card.length(), "*" );
cout << "\nMore secure display of credit card number: " << credit_card;
}string.replace()
#include <iostream>
#include <string>
using namespace std;
int main()
{
string str1("String handling C++ style.");
string str2("STL Power");
cout << "Initial strings:\n";
cout << "str1: " << str1 << endl;
cout << "str2: " << str2 << "\n\n";
// demonstrate replace
cout << "Replace 8 characters in str1 with str2:\n";
str1.replace(7, 8, str2);
cout << str1 << endl;
return 0;
}Initial strings:
str1: String handling C++ style.
str2: STL Power
Replace 8 characters in str1 with str2:
String STL Power C++ style.
string.replace( position, 2, ";123", 5, 2 )
#include <iostream>
using std::cout;
using std::endl;
#include <string>
using std::string;
int main()
{
string string1( "abc edfgh ijk lmno pqr stu vw xyz" );
cout << "Original string:\n" << string1 << endl << endl;
int position = string1.find( "." ); // find first period
while ( position != string::npos )
{
string1.replace( position, 2, "12345;;123", 5, 2 );
position = string1.find( ".", position + 1 );
}
cout << string1 << endl;
return 0;
}Original string:
abc edfgh ijk lmno pqr stu vw xyz
abc edfgh ijk lmno pqr stu vw xyz
