Regular Expression works in Regex101 but not Jupyter notebook

import re
with open('names.txt') as f:
    data = f.readlines()

twitter_pattern = re.compile(r"\s{1}[@]\w+")

twitter_match = twitter_pattern.findall(str(data))
print(twitter_match)

names.txt is a list of full names, phone numbers and twitter handles.
\s{1}[@]\w+ should return only twitter handles, but returns an empty list. Everything seems to be working fine in regex101, but not when I run this through Jupyter Notebook.

The content of the file is identical to the data provided in the Regex101 link:

Osterberg, Sven-Erik	governor@norrbotten.co.se		Governor, Norrbotten	@sverik
, Tim	tim@killerrabbit.com		Enchanter, Killer Rabbit Cave
Butz, Ryan	ryanb@codingtemple.com	(555) 555-5543	CEO, Coding Temple	@ryanbutz
Doctor, The	doctor+companion@tardis.co.uk		Time Lord, Gallifrey
Exampleson, Example	me@example.com	555-555-5552	Example, Example Co.	@example
Pael, Ripal	ripalp@codingtemple.com	(555) 555-5553	Teacher, Coding Temple	@ripalp

readlines() reads the text as an array of strings.

The file

Hello
World

gives the array ["Hello", "World"].

str(data) is the textual representation of that array. In Python that's the text ["Hello", "World"]. Note that the line break was consumed and interpreted as the start of the next item of the array.

In your case that means you get [ and ] as well as a lot of additional " and ,, with the consequence that you no longer have a whitespace after the Twitter handle.

To fix your code, don't read the file as an array, read it as text instead.

with open('twitter.txt') as f:
    data = f.read()              # instead of readlines()

Also, please don't make your Regex more complicated than necessary. \s@\w+ is identical but less confusing.