使用正则表达式python查找电子邮件 [英] find email using regular expression python

问题描述

我想在文本文件中找到有效的电子邮件地址，这是我的代码：

I want to find valid email addresses in a text file, and this is my code:

email = re.findall(r'[a-zA-Z\.-]+@[\w\.-]+',line)

但是我的代码显然不包含@符号前有数字的电子邮件地址。而且我的代码无法处理没有有效结尾的电子邮件地址。那么有人可以帮我解决这两个问题吗？谢谢！

But my code obviously does not contain email addresses where there are numbers before @ sign. And my code could not handle email addresses that do not have valid ending. So could anyone help me with these two problems? Thank you!

我的问题的一个例子是：

An example of my problem would be:

我的代码可以找到此电子邮件：xyz @ gmail.com

my code can find this email: [e-mail]

，但找不到此：[e-mail]

but it cannot find this one: [e-mail]

并且它无法过滤通过以下方式发送电子邮件：xyz @ gmail

And it cannot filter this email out either: xyz@gmail

推荐答案

从 python re docs ， \w 匹配任何字母数字字符和下划线，相当于集合 [a-zA-Z0-9 _] 。因此 [\w\ .-] 将适当地匹配数字和字符。

From the python re docs, \w matches any alphanumeric character and underscores, equivalent to the set [a-zA-Z0-9_]. So [\w\.-] will appropriately match numbers as well as characters.

email = re.findall(r'[\w\.-]+@[\w\.-]+(\.[\w]+)+',line)

这篇文章更加广泛地讨论了匹配的电子邮件地址，您遇到了很多陷阱，导致您的代码无法捕获匹配的电子邮件地址。例如，电子邮件地址不能完全由标点符号组成（ ... @ .... ）。此外，地址通常有最大长度，具体取决于电子邮件服务器。此外，许多电子邮件服务器都匹配非英语字符。因此，根据您的需求，您可能需要一个更全面的模式。

This post discusses matching email addresses much more extensively, and there are a couple more pitfalls you run into matching email addresses that your code fails to catch. For example, email addresses cannot be made up entirely of punctuation (...@....). Additionally, there is often a maximum length on addresses, depending on the email server. Also, many email servers match non-english characters. So depending on your needs you may need a more comprehensive pattern.

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