String replace

This is a discussion on String replace within the C++ Programming forums, part of the General Programming Boards category; Hey everyone, I'm trying to find a string within a larger string, then replace it with a value. Here is ...

  1. #1
    Registered User
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    String replace

    Hey everyone,

    I'm trying to find a string within a larger string, then replace it with a value. Here is an example (sudocode)?

    Code:
    string 1 = "this is REPLACE_STRING_HERE!";
    string 2 = "really cool"
    
    string1.replace("REPLACE_STRING_HERE", string2);
    
    cout << string1 << endl; //outputs this is really cool!
    How would I go about doing this?

    Thanks,

    Matt N
    ~guitarist809~

  2. #2
    Registered User
    Join Date
    Jan 2005
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    7,317
    Use find to find the location of the search string, then use that location plus the search string's size to get the range to replace with the new string.

  3. #3
    Cat without Hat CornedBee's Avatar
    Join Date
    Apr 2003
    Posts
    8,893
    You're quite close already. But replace() wants a position and a length or a pair of iterators to specify the position, so you need to use string::find() to get them.

    Code:
    pos = s.find(search_string);
    if(pos != string::npos) {
      s.replace(pos, search_string.length(), replacement);
    }
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

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