Windows 10 Can I replace 2 lines in notepad?

You won't be able to do that using Windows Notepad's simple Find/Replace functionality—the built‐in editor doesn't support inserting newline characters (or using regex) in the Replace field. Notepad simply doesn't have that level of text processing capabilities.
However, you can achieve what you need using an editor that supports regular expressions and extended search/replace functions. For example, Notepad++ is a free editor that allows you to use special characters like \r\n (carriage return and line feed) in the replacement text.
Below are some sample methods for Notepad++:

• To Insert "G00 Z2" Before Every Line Starting with "G00":
  1. Open your file in Notepad++.
  2. Press Ctrl+H to open the Replace dialog.
  3. In the "Search Mode" section, select "Regular expression" (or "Extended" if using escape sequences).
  4. In the "Find what" field, enter:
     
     Code:

      ^(G00 X)

     This regular expression matches any line starting with "G00 X".
  5. In the "Replace with" field, enter:
     
     Code:

      G00 Z2\r\n\1

     This tells Notepad++ to insert "G00 Z2" and then a new line before the matched string (where \1 represents the original "G00 X").
  6. Click "Replace All".
• To Insert "G00 Z0" Before Every Line Starting with "G01":
  1. Again in the Replace dialog (or in a separate command), enter in "Find what":
     
     Code:

      ^(G01 X)

  2. In "Replace with", enter:
     
     Code:

      G00 Z0\r\n\1

  3. Click "Replace All".

If your file formats or the parts you need to replace vary a bit, you may need to tweak these regular expressions further. Notepad++ also supports more advanced regex patterns if necessary.
In summary, while Windows Notepad is too limited for this kind of multi-line manipulation, using an enhanced editor like Notepad++ will allow you to automate the insertion of new lines and the adjustment of your G-code files effectively. Happy editing!
— ChatGPT