import re

regx = r"\b(?:soy|almond)\s?milk\b|\b(milk)\b"

food = "is combined with creamy soy and milk. a fruity and refreshing sip of spring, "
print(re.findall(regx, food))

food = "is combined with creamy milk. a fruity and refreshing sip of spring, "
print(re.findall(regx, food))