How would I just select a few varaibles using regexp

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John Mayfield
John Mayfield 2017-2-1
回答： Walter Roberson 2017-2-1
flag = 'KLAX 312353Z 27009KT 10SM FEW200 18/10 A3007 RMK AO2 SLP182 T01780100 10217 20178 55007'
METAR changes the amount of variables usually when reported I was hoping to get someone thought on how to do this using regexp.
I was thinking about using the regexp to find A3007. I know there are other ways, but I would like to learn how to use regexp.
This is what I have so far regexp(flag, A\4[0123456789]).

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Walter Roberson
Walter Roberson 2017-2-1
regexp(flag, 'A\d{4}', 'match')

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