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
----------------------------------------------------------------------