问题
I have below example in single line of text:
valuationType=RiskAnalysis,
commandType=SpreadRA,
pricing_date=20161230 01:00:00.000,
priority=51,
CamelFileLastModified=1483346829000,
CamelFileParent=/home/tisuat52/mount/tis/shared, message_size=239450,
solstis_set_name=OFFICIAL,
CamelFileRelativePath=TIS_RISKONE_SpreadRA_CREDITASIACNH_OFF_CreditGamma_Ido_RA_2016-12-30_1483138799000_Input.bin,
command_status=OK,
commandName=CREDITASIACNH_OFF_CreditGamma_Ido_RA,
calculator_timestamp=20170102 04:35:41.257,
CamelFileAbsolute=true,
CamelFileLength=53248.
Want to extract all text (mixed string, that is .*) right side of = to field whose name is left side of = and each field is separated by ,. And important is order is fixed but some fields are optional. If the Field is not present grok should create a field with empty value.
来源：https://stackoverflow.com/questions/41426198/extracting-many-optional-comma-separated-fields-using-grok-pattern