定期EX pression验证文件类型 [英] Validating file types by regular expression

问题描述

我有一个.NET Web窗体，有一个文件上传控件绑定到一个普通的前pression验证。这个验证需要验证，只有某些文件类型应该被允许上传（JPG，GIF，DOC，PDF格式）

I have a .NET webform that has a file upload control that is tied to a regular expression validator. This validator needs to validate that only certain filetypes should be allowed for upload (jpg,gif,doc,pdf)

目前常规EX pression，这是否是：

The current regular expression that does this is:

^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))(.jpg|.JPG|.gif|.GIF|.doc|.DOC|.pdf|.PDF)$

不过，这似乎并不奏效......谁能给我一点点章恩的帮助？

However this does not seem to be working...Can anyone give me a little reg ex help?

感谢。

推荐答案

您正则表达式似乎有点在我看来太复杂。此外，请记住点是一个特殊字符，意思是任何字符。下面的正则表达式应该工作（注意逃脱点）：

Your regex seems a bit too complex in my opinion. Also, remember that the dot is a special character meaning "any character". The following regex should work (note the escaped dots):

^.*\.(jpg|JPG|gif|GIF|doc|DOC|pdf|PDF)$

您可以像使用前preSSO 一个工具来测试你的正常EX pressions。

You can use a tool like Expresso to test your regular expressions.

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