string

[amarnath subbiah]

hi, i want to know the built-in function for extracting and replacing
a substring in a string.
i suppose it should be done using a sequence of built-in functions,,
pls help me

 

[Victor Bazarov]

hi, i want to know the built-in function for extracting and replacing
a substring in a string.

Extracing - 'substr' member in 'std::string'. Replacing - there is
no simple one-shot deal, use 'insert' after 'erase'.

i suppose it should be done using a sequence of built-in functions,,

Yes.

V

 

[hurcan solter]

ng in a string.

Extracing - 'substr' member in 'std::string'. Replacing - there is
no simple one-shot deal, use 'insert' after 'erase'.

something like this;

#include <iostream>
#include <string>
using namespace std;
int main()
{
string text = "dog bites cat";
string substring = "bites";
std::size_t pos=text.find(substring);
if(pos != string::npos)
text.erase(pos,substring.length()).insert(pos,"loves");
cout<< text;
}

 

[ppi]

#include <iostream>
#include <string>
using namespace std;
int main()
{
string text = "dog bites cat";
string substring = "bites";
std::size_t pos=text.find(substring);
if(pos != string::npos)
text.erase(pos,substring.length()).insert(pos,"loves");
cout<< text;

}

what about:
text.replace( pos, substring.length(), "loves" );

 

[hurcan solter]

what about:
text.replace( pos, substring.length(), "loves" );

seem like you are right . I always thought 'replace' replaces UPTO
substring.length of characters. if replacement string is smaller than
the replaced string the excess characters will remain in the
string.But apparently that is not the case.