[Python] Remove part of a string in python with regex [duplicate]

I'm trying to use a regex to remove off my string all text starting from and after ":q=". I have used the code below but it only removes ":q=". Is anyone be able to help me?

import re

string = ":example1:q=dfgghp-yoirjl78/-"

print(string)

x = re.sub(r':q=.?','', string)

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