[Python] Match word "A". If "B" is next word, match too

Using regex in Python I want to get the word "net" from string and if the word "wt" is the next, get too

Example:

string = "12 boxes net wt 1.oz 3.6g" #Must returns "net wt"

string = "12 boxes net 1.oz 3.6g" #Must returns "net"

Between "net" and "wt" could be "." "," or spaces

I used this regex but didn't work on the second example

pat = r'net([,.\s]*?)(wt?)'

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