History of "Search String" Registered during Replacement

When you use Search (S) > Replace (R) from the menu bar, the first word or symbol in the first line of the text is automatically registered in the search string, which is annoying.
If the first line of the text is a new line only, this does not appear to occur, but I am not sure if it is a bug or specification.
If it's a specification, is there a way to prevent the first word or symbol of the text from being registered in the string to be searched?