电子邮件的正则表达式 [英] Regular expression for email

问题描述

可能重复：

我正在使用此特定的正则表达式来检查电子邮件。

I am using this particular regular expression for checking emails.

"^[A-Za-z0-9](([a-zA-Z0-9,=\.!\-#|\$%\^&\*\+/\?_`\{\}~]+)*)@(?:[0-9a-zA-Z-]+\.)+[a-zA-Z]{2,9}$"

我遇到的问题是，这允许在 @符号前加句号。
可以通过任何方式对此表达式进行修改，以使这种情况不会发生，但仍保留所有其他条件。

The issue I have is that, this allows periods before the "@" symbol. Is there any way this expression be modified so that this does not happen, yet all other conditions are maintained.

a。@ b.com应该无效

[e-mail] should be invalid

预先感谢
-Rollin

Thanks in advance -Rollin

推荐答案

您可以将 [^ \。] 放在 @ 之前，以便允许除点以外的任何字符

you could put [^\.] before the @ so that it will allow any character except the dot

当然这可能不是您想要的，因此您可以在其中放入带有任何合法字符的 []

of course this is probably not what you want, so you could just put a [] with any legal characters in it

以防万一某人只有一个字符的电子邮件名（我的意思是 @ 之前的部分），您可能需要使用 |

just in case someone has a email name (i mean the part before the @) that is just 1 character, you might need to get creative with the |

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