get_entity Cannot find any entity corresponding to “xxxx”

[agoukuaile]

Code that causes the issue

client.get_entity('xxxx')

Now telegram allows four-character usernames, but this method fails to get any four-character usernames

Expected behavior

a channel info

Actual behavior

Cannot find any entity corresponding to “xxxx”

Traceback

No response

Telethon version

1.28.5

Python version

3.9.13

Operating system (including distribution name and version)

Windows 11

Other details

No response

Checklist

• [x] The error is in the library's code, and not in my own.
• [X] I have searched for this issue before posting it and there isn't an open duplicate.
• [X] I ran pip install -U https://github.com/LonamiWebs/Telethon/archive/v1.zip and triggered the bug in the latest version.

[Lonami]

Please include the traceback. As it stands, the error may be legit.

[agoukuaile]

@xxxx is a channel Now telegram allows 4 character usernames,in https://fragment.com/ we can buy 4 character username

in \telethon\utils.py file

VALID_USERNAME_RE = re.compile(
    r'^([a-z](?:(?!__)\w){3,30}[a-z\d]'
    r'|gif|vid|pic|bing|wiki|imdb|bold|vote|like|coub)$',
    re.IGNORECASE
)

change To

VALID_USERNAME_RE = re.compile(
    r'^([a-z](?:(?!__)\w){2,30}[a-z\d]'
    r'|gif|vid|pic)$',
    re.IGNORECASE
)

[Lonami]

The above commit should allow any username between 3 and 32 characters now (as long as there is no trailing underscore or two underscores together).

[agoukuaile]

VALID_USERNAME_RE = re.compile(
    r'^([a-z](?:(?!__)\w){3,30}[a-z\d]'
    r'|gif|vid|pic|bing|wiki|imdb|bold|vote|like|coub)$',
    re.IGNORECASE
)

def main(username):
    if VALID_USERNAME_RE.match(username):
        print ('match')
    else:
        print ('not match')

main('didi')

The content of the print of the above code is not match, I think this regularization is not correct

[Lonami]

You are likely not using the latest version. The above commit may not be in PyPi yet.