Capture only exact word with regex in python [duplicate]

Question

I want to capture with regex all the files in a folder that contain for example the string "key1" but I don't want to capture the files that have another character after that.

Let's say in the folder there are three files:

• key1.txt
• key12.txt
• xykey1.txt

When I execute my code, I would like only the first and third file to show.

This is the code I have:

import os
import re

dest = "C:\Work\Python\Files"

for root, dirs, files in os.walk(dest):
    for file in files:
        if re.findall("key1", file, re.IGNORECASE):
            print(file)

With my current code, all three files are caught.

Can someone give me a hint on how not to get "key12" but only the files which contain "key1"?