正则表达式从电子邮件地址中提取顶级域名 [英] Regex to extract top level domain from email address

问题描述

通过电子邮件地址

[e-mail]
[e-mail]
[e-mail]

在所有情况下，我想编写一个应返回"uk"的正则表达式.

I want to write a regex which should return 'uk' is all the cases.

我尝试过

'+@([^.]+)\..+' 

仅给出域名.我尝试使用

which gives only the domain name. I have tried using

'[^/.]+$'  

但是它给出了错误.

推荐答案

提取所需内容的正则表达式为:

The regex to extract what you are asking for is:

\.([^.\n\s]*)$  with /gm modifiers

说明:

    \. matches the character . literally
1st Capturing group ([^.\n\s]*)
    [^.\n\s]* match a single character not present in the list below
        Quantifier: Between zero and unlimited times, as many times as possible, giving back as needed [greedy]
        . the literal character .
        \n matches a fine-feed (newline) character (ASCII 10)
        \s match any white space character [\r\n\t\f ]
$ assert position at end of a line
m modifier: multi-line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
g modifier: global. All matches 

对于您的输入示例，将为:

for your input example, it will be:

import re
m = re.compile(r'\.([^.\n\s]*)$', re.M)                                             
f = re.findall(m, data)                                                             
print f 

输出:

['uk', 'uk', 'uk']

希望这会有所帮助.

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