从电子邮件地址检索域名

Question

I am working on a huge email-address dataset in Python and need to retrieve the organization name.

For example, email@organizationName.com is easy to extract, but what about email@info.organizationName.com or even email@organizationName.co.uk ?

I need a universal extractor that should be able to handle all different possibilities accordingly.

Answer 1

如果组织名称总是在 .com 或其他结尾之前 - 这可能有效 -

        email_str.split('@')[1].split('.')[-2]

Answer 2

A regex won't work well here. In order to be able to reliably do this, you need to use a lib that has knowledge on what constitutes a valid suffix.

Otherwise, how would the extractor be able distinguish email@info.organizationName.com from email@organizationName.co.uk ?

This can be done using tldextract :

Example:

import tldextract

emails = ['email@organizationName.com', 
          'email@info.organizationName.com', 
          'email@organizationName.co.uk',
          'email@info.organizationName.co.uk',
         ]

for addr in emails:
    print(tldextract.extract(addr))

Output:

ExtractResult(subdomain='', domain='organizationName', suffix='com')
ExtractResult(subdomain='info', domain='organizationName', suffix='com')
ExtractResult(subdomain='', domain='organizationName', suffix='co.uk')
ExtractResult(subdomain='info', domain='organizationName', suffix='co.uk')

To access just the domain, use tldextract.extract(addr).domain .