regex returning null value

Question

I have wrote following code in my Vscode python file.

import  os
import  re
filecontent=[]
new_list=[]
"""Placeholder, change, rename, remove... """
for file in os.listdir("resources/"):
    if file.endswith(".txt"):
        with open(os.path.join("resources/", file), "r") as files:
            filecontent = files.read()
            new_list.append(filecontent)
regex = re.compile(r'[\^======================$]*^Username:(\w+)')
for items in new_list:
    print(regex.findall(items))

And structure of my text file is

======================
Username:apple
email:[email protected]
phonenumber:8129812891
address:kapan
======================
======================
Username:apple
email:[email protected]
phonenumber:8129812891
address:kapan
======================
Username:apple
email:[email protected]
phonenumber:9841898989
address:kapan
======================
Username:apple
email:[email protected]
phonenumber:1923673645
address:kapan
======================

When i verify it in online regex checker. It works fine. But when i run it in my app it returns empty list.
[1]: https://i.sstatic.net/2Mrlb.png What is the wrong thing i am doing here?

In the online regex checker you are using the flags gm. But in your code you don't pass any flags to re.compile. Your use of $ and ^ will not work as expected if you don't compile the regex using the multiline flag. docs.python.org/3/library/re.html#re.M — Håken Lid
– Håken Lid, Commented Feb 12, 2021 at 6:25

PacketLoss · Accepted Answer · 2021-02-12 05:29:08Z

1

There is no need to match the === here. You can just search the username and return the result.

You can also remove your re.compile() and just run re.findall(r'Username:\w+', items)

with open('test.txt', 'r') as file:
    data = file.read()
    print(re.findall(r'Username:(\w+)', data))
    print(re.findall(r'Username:\w+', data))


#['apple', 'apple', 'apple', 'apple']
#['Username:apple', 'Username:apple', 'Username:apple', 'Username:apple']

answered Feb 12, 2021 at 5:29

PacketLoss

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