Question : find and replace using awk?

Hi, can some one let me know how I can use an awk script to be able to search every line in the file and find the state and zip code and insert a comma(,) between the state and zip fields. My file sample is shown below. Thanks for the  help.

Code Snippet:

1: 2: 3: 4:

john, doe, MO 78985 Mary, decker, TX 89989 Jason ,smith ,789 3r;st, NY 10009 charles, NY 10007

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Answer : find and replace using awk?

awk '{p=match($0,/[A-Z][A-Z] +[0-9][0-9][0-9][0-9][0-9]-[0-9][0-9][0-9]/);print substr($0,1,p+1) "," substr($0,p+2)}' file.txt