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
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(?-imsx: group, but do not capture (case-sensitive)
(with ^ and $ matching normally) (with . not
matching \n) (matching whitespace and #
normally):
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^ 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
----------------------------------------------------------------------
\, ','
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' '
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( 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
----------------------------------------------------------------------
\] ']'
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' '
----------------------------------------------------------------------
\" '"'
----------------------------------------------------------------------
\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))
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| OR
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- '-'
----------------------------------------------------------------------
) end of \12
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' '
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\" '"'
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( group and capture to \13:
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.*? any character except \n (0 or more times
(matching the least amount possible))
----------------------------------------------------------------------
) end of \13
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\" '"'
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' '
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\" '"'
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\.*? '.' (0 or more times (matching the least
amount possible))
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\" '"'
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$ before an optional \n, and the end of the
string
----------------------------------------------------------------------
) end of grouping
----------------------------------------------------------------------
