Thread: replacing a substring of a string with another string

replace() has many forms. http://www.cplusplus.com/reference/s...g/replace.html

I suspect the first one will suit your needs.

Code:

string& replace ( size_t pos1, size_t n1,   const string& str );

For example, this should print 1cat4.

Code:

string original = "1234";
string replace = "cat";
// replace original[1] .. original[2] ("23") with "cat"
original.replace(1, 2, replace);
cout << original;

Hopefully I thought that through correctly . . . and hopefully I've answered your question.

[edit] In your first case, maybe you want something like this.

Code:

string str, str2, str3;
str  = "an adequate amount of text";
str2 = "amount of ";
st3 = "";

while(1) {
    // search for an occurance of str2 in str
    size_t found = str.find(str2);

    // if such a substr was found,
    if(found != string::npos) {
        // replace it with str3
        str.replace(found, str2.length(), str3);
    }
    else break;  // if the substring wasn't found, exit the loop
}

See also http://www.cplusplus.com/reference/s...ring/find.html
[/edit]