C++ string replace

[SphinCorp]

I need to be able to replace all occurences of a string within another. in vb.net it would be:

string = string.replace("chars to replace", "replace with")

My latest attempt was:

COM.replace (COM[1], COM[COM.length()], " ", "");

It also failed miserably. How would I do this?

I think it has something to do with this : http://www.cplusplus.com/reference/algorithm/replace.html

But I've never worked with vectors or algorithms before, so I am clueless on how to implement this on a string.

Thanks in advance,
Richard Carson

 

[Shadow2531]

Here's an old thread where I asked this question. It might help.
http://www.hardforum.com/showthread.php?t=979477

 

[Python]

Try

#include <algorithm> // for remove()

remove( string.begin(), string.end(), ' ' );

 

[Sir_Poop_Alot]

Use CString! It comes with a Replace function.

 

[mikeblas]

Yeah, use CString::Replace. I wrote it!

 

[Whatsisname]

learn to use regular expressions.

 

[Sir_Poop_Alot]

Yeah, use CString::Replace. I wrote it!

Did you really? Your name does look familiar.

 

[mikeblas]

Yes, really. It was more than a decade ago, now.

Regular expressions are useful to know, but they're far more than is needed for simple match-and-replace work.

 

[wuggle]

http://www.sgi.com/tech/stl/basic_string.html

Use a combination of string.find() / string.replace() inside a while loop

 

[Cyrilix]

http://www.sgi.com/tech/stl/basic_string.html

Use a combination of string.find() / string.replace() inside a while loop

Typically, I do that as well.

 

[Sir_Poop_Alot]

Yes, really. It was more than a decade ago, now.

Regular expressions are useful to know, but they're far more than is needed for simple match-and-replace work.

Okay I remember you now. I think I stumble upon your work blog or something once. Nice to meet you and see you on this forum, Mike.

 

[Shadow2531]

This (based on Monkeyshave's example in the thread I posted) works pretty good:

#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

string replace_all_copy(const string& haystack, const string& needle, const string& replacement) {
    if (needle.empty()) {
        return haystack;
    }
    string result;
    for (string::const_iterator substart = haystack.begin(), subend; ; ) {
        subend = search(substart, haystack.end(), needle.begin(), needle.end());
        copy(substart, subend, back_inserter(result));
        if (subend == haystack.end()) {
            break;
        }
        copy(replacement.begin(), replacement.end(), back_inserter(result));
        substart = subend + needle.size();
    }
    return result;
}

int main() {
    cout << replace_all_copy("zipmeowbam", "meow", "zam") << "\n";
}