pyparsing question: single word values with a double quoted string every once in a while

[hubritic]

I want to parse a log that has entries like this:

[2009-03-17 07:28:05.545476 -0500] rprt s=d2bpr80d6 m=2 mod=mail
cmd=msg module=access rule=x_dynamic_ip action=discard attachments=0
rcpts=1
routes=DL_UK_ALL,NOT_DL_UK_ALL,default_inbound,firewallsafe,mail01_mail02,spfsafe
size=4363 guid=291f0f108fd3a6e73a11f96f4fb9e4cd hdr_mid=
qid=n2HCS4ks025832 subject="I want to interview you" duration=0.236
elapsed=0.280


the keywords will not always be the same. Also differing log levels
will provide a different mix of keywords.

This is good enough to get the majority of cases where there is a
keyword, a "=" and then a value with no spaces:

Group(Word(alphas + "+_-.").setResultsName("keyword") +  Suppress
(Literal ("=")) + Optional(Word(printables)))

Sometimes there is a subject, which is a quoted string. That is easy
enough to get with this:
dblQuotedString(ZeroOrMore(Word(printables) ) )

My problem is combining them into one expression. Either I wind up
with just the subject or I wind up with they keywords and their
values, one of which is:

subject, '"I'

which is clearly not what I want.

Do I scan each line twice, first looking for quotes ?

Thanks