问是否可以将REGEX搜索缩小到我想要的字符串的特定实例？

EN

>  9 | 10 | Optimal    |    1 | HDD | B     | 1/9   0/10 <<== the str i get w/find
> 10 | 11 | Optimal    |    1 | HDD | A     | 0/11  1/12 <<<=== the string I want

To narrow the scope, I've tried including \n and \r and the hat-sign and none of them work to return the string I want. 

>>> pattern = re.compile(r' 10 \|')
>>> matches = pattern.finditer(searchstring)
>>> for match in matches:
    print(match)

> <_sre.SRE_Match object; span=(793, 798), match=' 10 |'> <<== the str i get w/find
> <_sre.SRE_Match object; span=(845, 850), match=' 10 |'> <<<=== the string I want
> <_sre.SRE_Match object; span=(1488, 1493), match=' 10 |'>
> <_sre.SRE_Match object; span=(1713, 1718), match=' 10 |'>
>>> 

## Another example of what I tried showing no matches found.
>>> pattern = re.compile(r'(\n) 10 \|')
>>> for match in matches:
    print(match)

>  -------------------------------------------------------------------------
> 0/10  |  3 | HD | 6 Gbps | HUC10 | S07 | Optimal    | RTEXKWKRR
>  1/4   |  4 | HD | 6 Gbps | HUC10 | S09 | Optimal    | L0TBLPVGK
>  1/9   |  5 | HD | 6 Gbps | HUC10 | S09 | Optimal    | HEDBPVTGK
>  --------------------------------------------------------------------------
>  0/10 |    14 | 06/12/16 00:04:57 | CHECK CONDITION
>  1/9  |    37 | 07/22/18 09:14:33 | CHECK CONDITION 


## Examples of what I've tried with the results

>>> with open((r'summary_a.out'), 'r')  as csvfile:
      searchstring = csvfile.read().strip()
      pattern = re.compile(r"^10\s+\|")
      matches = pattern.finditer(searchstring)
      for match in matches:
        print(match)

>>> No output.

## Other patterns tried with the same lack of output:
      pattern = re.compile(r"\\n10\s+\|")
      pattern = re.compile(r"\\n^10\s+\|")
      pattern = re.compile("\\n^10\s+\|")
      pattern = re.compile("^10\s+\|")
      pattern = re.compile('^10\s+\|')
      pattern = re.compile('/^10\s+\|')
**    pattern = re.compile('^1\/9\s+\|')

>>> No output.

** The following pattern, ('^1/9  |'), yielded results but not what was expected.
** Output         
> <_sre.SRE_Match object; span=(0, 0), match=''>
   -------------- lines deleted ---------------------
> <_sre.SRE_Match object; span=(2525, 2525), match=''>
>>> 

## This pattern, ('^0/10  |'), yields the same results as above: