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To create a search-and-replace function for string objects involves these steps: 1 Create a function called search_and_replace( ) that has this prototype:
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bool search_and_replace(string &str, const string &oldsubstr, const string &newsubstr);
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The string to be changed is passed via str The substring to replace is passed in oldsubstr The replacement is passed in newsubstr 2 Use the find( ) function to find the first occurrence of oldsubstr 3 Use the replace( ) function to substitute newsubstr 4 Return true if a replacement was made and false otherwise
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The find( ) method is described by the preceding recipe and that discussion is not repeated here Once the substring has been found, it can be replaced by calling replace( ) There are ten forms of replace( ) The one used by this recipe is shown here: string &replace(size_type indx, size_type len, const string &str) Beginning at indx within the invoking string, this version replaces up to len characters with the string in str The reason that it replaces "up to" len characters is that it is not possible to replace past the end of the string Thus, if len + indx exceeds the total length of the string, then only those characters from indx to the end will be replaced The function returns a reference to the invoking string
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Here is one way to implement the search_and_replace( ) function:
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// In the string referred to by str, replace oldsubstr with newsubstr // Thus, this function modifies the string referred to by str // It returns true if a replacement occurs and false otherwise bool search_and_replace(string &str, const string &oldsubstr, const string &newsubstr) { string::size_type startidx; startidx = strfind(oldsubstr); if(startidx != string::npos) { strreplace(startidx, oldsubstrsize(), newsubstr); return true; } return false; }
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If you compare this version of search_and_replace( ) with the one created for null-terminated strings, you will see that this version is substantially smaller and simpler There are two reasons for this First, because objects of type string are dynamic, they can grow or shrink as needed
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Therefore, it is easy to replace one substring with another There is no need to worry about overrunning an array boundary when the length of the string is increased, for example Second, string supplies a replace( ) function that automatically handles the removal of the old substring and the insertion of the new substring This does not need to be handled manually, as is the case when inserting into a null-terminated string The following example shows the search_and_replace( ) function in action
// 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"; cout << "Original string: " << str << "\n\n"; cout << "Replacing 'is' with 'was':\n"; // The following replaces is with was Notice that // it passes string literals for the substrings // These are automatically converted into string objects while(search_and_replace(str, "is", "was")) cout << str << endl; cout << endl; // Of course, you can explicitly pass string objects, too 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; } // In the string referred to by str, replace oldsubstr with newsubstr // Thus, this function modifies the string referred to by str // It returns true if a replacement occurs and false otherwise bool search_and_replace(string &str, const string &oldsubstr, const string &newsubstr) { string::size_type startidx; startidx = strfind(oldsubstr);
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if(startidx != string::npos) { strreplace(startidx, oldsubstrsize(), newsubstr); return true; } return false; }
The output is shown here:
Original string: This is a test So is this Replacing 'is' with 'was': Thwas is a test So is this Thwas was a test So is this Thwas was a test So was this Thwas was a test So was thwas Replace 'So' with 'So too' Thwas was a test So too was thwas
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