Python正则表达式，在地址中查找电子邮件域 [英] Python Regular Expressions, find Email Domain in Address

问题描述

我知道我是个白痴，但我无法从这个电子邮件地址中拉出这个域名：

I know I'm an idiot, but I can't pull the domain out of this email address:

'[e-mail]'

我想要的输出：

'@gmail.com'

我目前的输出：

.

（只是一个句点字符）

以下是我的代码：

import re
test_string = '[e-mail]'
domain = re.search('@*?\.', test_string)
print domain.group()

这是我认为我的正则表达式（'@ * ?.'，test_string）：

Here's what I think my regular expression says ('@*?.', test_string):

 ' # begin to define the pattern I'm looking for (also tell python this is a string)

  @ # find all patterns beginning with the at symbol ("@")

  * # find all characters after ampersand

  ? # find the last character before the period

  \ # breakout (don't use the next character as a wild card, us it is a string character)

  . # find the "." character

  ' # end definition of the pattern I'm looking for (also tell python this is a string)

  , test string # run the preceding search on the variable "test_string," i.e., '[e-mail]'

我基于这里的定义：

http：/ /docs.activestate.com/komodo/4.4/regex-intro.html

此外，我搜索，但其他答案对我来说有点太难了让我的头脑。

Also, I searched but other answers were a bit too difficult for me to get my head around.

帮助是非常感谢，像往常一样。谢谢。

Help is much appreciated, as usual. Thanks.

我的东西如果重要：

Windows 7 Pro bit）

Windows 7 Pro (64 bit)

Python 2.6（64位）

Python 2.6 (64 bit)

---

PS。 StackOverflow quesiton：我的帖子不包括新行，除非我们之间两次返回。例如（当我发布时，这些都在不同的行）：

---

PS. StackOverflow quesiton: My posts don't include new lines unless I hit "return" twice in between them. For example (these are all on a different line when I'm posting):

@ - 找到以at符号（@）开头的所有模式
* - 在&符号
之后找到所有字符？ - 找到期限之前的最后一个字符
\ - breakout（不要使用下一个字符作为通配符，我们是一个字符串字符）
。 - 找出 。字符
，测试字符串 - 在变量test_string上运行前面的搜索，即'[e-mail]'

@ - find all patterns beginning with the at symbol ("@") * - find all characters after ampersand ? - find the last character before the period \ - breakout (don't use the next character as a wild card, us it is a string character) . - find the "." character , test string - run the preceding search on the variable "test_string," i.e., '[e-mail]'

这就是为什么我有一个空白线b / w每行上面。我究竟做错了什么？ Thx。

That's why I got a blank line b/w every line above. What am I doing wrong? Thx.

推荐答案

这是我认为可能有帮助的东西

Here's something I think might help

import re
s = 'My name is Conrad, and [e-mail] is my email.'
domain = re.search("@[\w.]+", s)
print domain.group()

输出

@gmail.com

正则表达式的工作原理：

How the regex works:

@ - 扫描直到你看到这个角色

@ - scan till you see this character

[\w。] 一组可能匹配的字符，所以 \w 是所有字母数字字符，尾随时段。添加到该组字符。

[\w.] a set of characters to potentially match, so \w is all alphanumeric characters, and the trailing period . adds to that set of characters.

+ 前一集中的一个或多个。

+ one or more of the previous set.

因为这个正则表达式与<$ c $之后的句点字符和每个字母数字匹配c> @ ，即使在句子中间也会匹配电子邮件域。

Because this regex is matching the period character and every alphanumeric after an @, it'll match email domains even in the middle of sentences.

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