I think this is the problem: \"\S+\"

Maybe these tools will help:

• The Perl Regex Tester
• YAPE::Regex::Explain ... Tip #9 from the Basic debugging checklist

  The regular expression:
  
  (?-imsx:^(\S+)\, (\S+) (\S+) \- \- \[(\d{2})/(\w+)/(\d{4})\:(\d{2})\:(
  +\d{2})\:(\d{2})\+(\d{4})\] \"\S+\" (\d{3}) (\d+|-) \"(.*?)\" \"\.*?\"
  +$)
  
  matches as follows:
    
  NODE                     EXPLANATION
  ----------------------------------------------------------------------
  (?-imsx:                 group, but do not capture (case-sensitive)
                           (with ^ and $ matching normally) (with . not
                           matching \n) (matching whitespace and #
                           normally):
  ----------------------------------------------------------------------
    ^                        the beginning of the string
  ----------------------------------------------------------------------
    (                        group and capture to \1:
  ----------------------------------------------------------------------
      \S+                      non-whitespace (all but \n, \r, \t, \f,
                               and " ") (1 or more times (matching the
                               most amount possible))
  ----------------------------------------------------------------------
    )                        end of \1
  ----------------------------------------------------------------------
    \,                       ','
  ----------------------------------------------------------------------
                             ' '
  ----------------------------------------------------------------------
    (                        group and capture to \2:
  ----------------------------------------------------------------------
      \S+                      non-whitespace (all but \n, \r, \t, \f,
                               and " ") (1 or more times (matching the
                               most amount possible))
  ----------------------------------------------------------------------
    )                        end of \2
  ----------------------------------------------------------------------
                             ' '
  ----------------------------------------------------------------------
    (                        group and capture to \3:
  ----------------------------------------------------------------------
      \S+                      non-whitespace (all but \n, \r, \t, \f,
                               and " ") (1 or more times (matching the
                               most amount possible))
  ----------------------------------------------------------------------
    )                        end of \3
  ----------------------------------------------------------------------
                             ' '
  ----------------------------------------------------------------------
    \-                       '-'
  ----------------------------------------------------------------------
                             ' '
  ----------------------------------------------------------------------
    \-                       '-'
  ----------------------------------------------------------------------
                             ' '
  ----------------------------------------------------------------------
    \[                       '['
  ----------------------------------------------------------------------
    (                        group and capture to \4:
  ----------------------------------------------------------------------
      \d{2}                    digits (0-9) (2 times)
  ----------------------------------------------------------------------
    )                        end of \4
  ----------------------------------------------------------------------
    /                        '/'
  ----------------------------------------------------------------------
    (                        group and capture to \5:
  ----------------------------------------------------------------------
      \w+                      word characters (a-z, A-Z, 0-9, _) (1 or
                               more times (matching the most amount
                               possible))
  ----------------------------------------------------------------------
    )                        end of \5
  ----------------------------------------------------------------------
    /                        '/'
  ----------------------------------------------------------------------
    (                        group and capture to \6:
  ----------------------------------------------------------------------
      \d{4}                    digits (0-9) (4 times)
  ----------------------------------------------------------------------
    )                        end of \6
  ----------------------------------------------------------------------
    \:                       ':'
  ----------------------------------------------------------------------
    (                        group and capture to \7:
  ----------------------------------------------------------------------
      \d{2}                    digits (0-9) (2 times)
  ----------------------------------------------------------------------
    )                        end of \7
  ----------------------------------------------------------------------
    \:                       ':'
  ----------------------------------------------------------------------
    (                        group and capture to \8:
  ----------------------------------------------------------------------
      \d{2}                    digits (0-9) (2 times)
  ----------------------------------------------------------------------
    )                        end of \8
  ----------------------------------------------------------------------
    \:                       ':'
  ----------------------------------------------------------------------
    (                        group and capture to \9:
  ----------------------------------------------------------------------
      \d{2}                    digits (0-9) (2 times)
  ----------------------------------------------------------------------
    )                        end of \9
  ----------------------------------------------------------------------
    \+                       '+'
  ----------------------------------------------------------------------
    (                        group and capture to \10:
  ----------------------------------------------------------------------
      \d{4}                    digits (0-9) (4 times)
  ----------------------------------------------------------------------
    )                        end of \10
  ----------------------------------------------------------------------
    \]                       ']'
  ----------------------------------------------------------------------
                             ' '
  ----------------------------------------------------------------------
    \"                       '"'
  ----------------------------------------------------------------------
    \S+                      non-whitespace (all but \n, \r, \t, \f,
                             and " ") (1 or more times (matching the
                             most amount possible))
  ----------------------------------------------------------------------
    \"                       '"'
  ----------------------------------------------------------------------
                             ' '
  ----------------------------------------------------------------------
    (                        group and capture to \11:
  ----------------------------------------------------------------------
      \d{3}                    digits (0-9) (3 times)
  ----------------------------------------------------------------------
    )                        end of \11
  ----------------------------------------------------------------------
                             ' '
  ----------------------------------------------------------------------
    (                        group and capture to \12:
  ----------------------------------------------------------------------
      \d+                      digits (0-9) (1 or more times (matching
                               the most amount possible))
  ----------------------------------------------------------------------
     |                        OR
  ----------------------------------------------------------------------
      -                        '-'
  ----------------------------------------------------------------------
    )                        end of \12
  ----------------------------------------------------------------------
                             ' '
  ----------------------------------------------------------------------
    \"                       '"'
  ----------------------------------------------------------------------
    (                        group and capture to \13:
  ----------------------------------------------------------------------
      .*?                      any character except \n (0 or more times
                               (matching the least amount possible))
  ----------------------------------------------------------------------
    )                        end of \13
  ----------------------------------------------------------------------
    \"                       '"'
  ----------------------------------------------------------------------
                             ' '
  ----------------------------------------------------------------------
    \"                       '"'
  ----------------------------------------------------------------------
    \.*?                     '.' (0 or more times (matching the least
                             amount possible))
  ----------------------------------------------------------------------
    \"                       '"'
  ----------------------------------------------------------------------
    $                        before an optional \n, and the end of the
                             string
  ----------------------------------------------------------------------
  )                        end of grouping
  ----------------------------------------------------------------------
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