Possible problem with looking-back function

[Vinicius Jose Latorre <viniciusjl@ig.com.br>]

Hi,


I'm not sure if there is a problem with looking-back function in Emacs 24.

Let me explain the problem.

Suppose the buffer content is:

| 1| .\n
| 2| \n
| 3| \ \ \ \n
| 7| \t\n
| 9| \n
|10| \n
|11| :

Where:
    .    represents the point position
    \n   represents the end of line
    \    represents a space character
    \t   represents a tab character
    :    represents the end of buffer

The numbers at first column indicates the point position at beginning of 
line.

Ok, executing the following code:

    (progn
      (looking-at "^\\([ \t\n]+\\)")
      (match-end 1))

It returns 11.

Now executing:

    (progn
      (goto-char 11)                     ; go to end of buffer
      (looking-back "^\\([ \t\n]+\\)" 1 t)
      (match-beginning 1))

It returns 9.

Shouldn't it return 1?