How to search for particular types of words from a list in a sentence given in the user input?

Question

I found out that by importing re and using re.search I can search for a particular word in a sentence or a whole text.

import re

user_input = input().lower()
if re.search('food', user_input):
print ("Are you a foodie?")
else:
print('cool, bro')

In the code below this text I am using the if statement to find if a whole expression is in the list(ex. greetings)

import random

greeings = ["hello", "hi", "greetings", "sup", "what's up", "hey"]
response = ['hey', 'Good morning', "hi", "hi there", "hello"]

user_input =input().lower()
if user_input in greetings:
random_response = random.choice(response)
print(random_response)

My question is:
How can I substitute the word 'food' in the first code so that the program is looking through a whole list of words like the second code's greetings list?

Answer 1

from random import choice
import re

greetings = ("hello", "hi", "greetings", "sup", "what's up", "hey")
response = ('hey', 'Good morning', "hi", "hi there", "hello")

user_input = input().lower()
if any(re.search(r'\b' + greeting + r'\b', user_input) for greeting in greetings):
print(choice(response))
else:
print('Try again')

~~ You can pre-compile the regex pattern as well:

pattern = re.compile('|'.join(r'(\b' + greeting + r'\b)' for greeting in greetings))

if pattern.search(input().lower()):
print(choice(response))
else:
print('Try again')

Answer 2

import re, random

greetings = ["hello", "hi", "greetings", "sup", "what's up", "hey"]
response = ["hey", "Good morning", "hi", "hi there", "hello"]

user_input = input().lower()

if any(re.fullmatch(user_input, word) for word in greetings):
random_response = random.choice(response)
print(random_response)
else:
print("Try again")