@mtryfoss: regarding the subst, probably it does the job with ipv4, however in regexp . is matching any char, if you want to restrict it to match . as a char, one way is to enclose it inside square brackets, like:

subst("/;alias=[0-9]+[.][0-9]+[.][0-9]+[.][0-9]+~[0-9]+~[0-9]+//g");

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