Search cell that contains multiple numbers and text and pull out only the negative number

I have a report that runs automatically from a point of sale system which automatically provides a .pdf which I then in turn copy and paste into Excel for easier manipulation. The problem is that when pasted, it automatically places all the information in cell A. I need to be able to extract just the last number from this cell, which is always a negative number (dollar amount), and place it in a separate cell for easier reporting. I used the following formula, in Column D, to extract the needed text from cell A1, =IF(ISNUMBER(SEARCH("text",A1)),"text".

What I need to do now is extract just the last number in that cell which is negative. I could use the same formula, but would have to repeat it hundreds or thousands of times with the increasing dollar amounts in order for this to work. I would need for B1 to display 7.48, B2 to display 21.00, and so forth in this example. Is this possible?