field extraction - regex handle fields with no values

[pc1234]

I'm trying to write a field extraction on the search head using a regex .

the sample data is as follows

FIELDS: user,email,type,ip

EVENT1: abc,abc@xyz.com,password ,127.0.0.1

EVENT2: xyz,,,127.0.0.5

the fields are comma-delimited whether or not there are values for each fields . In second event, email and type fields have no values(user and ip fields ALWAYS have values) 

Can someone assist me in a regex to handle all fields? if the field has no value (email or type) assign no values to the fields .

Thanks in advance.

[ITWhisperer · Accepted solution]

| rex "(?<user>[^,]*),(?<email>[^,]*),(?<type>[^,]*),(?<ip>[^,]*)"