Regular Expression Validator 1

[peebman2000]

Hello everyone, I have using the regular expression validator for an app to only upload .txt files only. When I run the app and I choose file other than .txt file it shows my validation error, but when I choose a .txt file also it still shows my validation error. It basically shows the validation error no matter what file I choose, i want it to only show the validation error when choosing non .txt files. Here is my code below, does anyone know why the valdation error continues to show up, no matter what file I select?

<asp:RegularExpressionValidator ID="FileUploadValidator" runat="server" ControlToValidate="FileUpload1"
ErrorMessage="Upload .Txt files only." Style="z-index: 104; left: 551px; position: absolute;
top: 125px" ValidationExpression='"^(([a-zA-Z]|(\\{2}\w+)\$?)(\\(\w[\w].*))(.txt|.TXT)$"'></asp:RegularExpressionValidator>

 

[ca8msm]

Are you saying the regular expression is incorrect or that it isn't being applied correctly? If it's the former, try using the Regulator from:

http://regex.osherove.com/

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[jbenson001]

I think it would just be easier to get the last 3 characters of the postedfile name and see it = "txt

 

[vbkris]

yeah, i agree with jbenson's way.

i think this will do the trick:

<asp:RegularExpressionValidator ID="FileUploadValidator" runat="server" ControlToValidate="FileUpload1"
ErrorMessage="Upload .Txt files only." Style="z-index: 104; left: 551px; position: absolute;
top: 125px" ValidationExpression='.+(\.txt|\.TXT)$'></asp:RegularExpressionValidator>

Known is handfull, Unknown is worldfull

 

[ca8msm]

The only guaranteed method would be to check server-side though (but this won't stop the content being posted to the server, nor will it stop someone renaming a file before uploading it).


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[vbkris]

yeah, that too you should always check the content type so that invalid content does not get into the system (some DLL renamed as .txt)...

Known is handfull, Unknown is worldfull

 

[peebman2000]

Hey guys thanks for all of your replys, I tried VBKris method and it worked and I found the Regular expression libray at

http://regexlib.com/Search.aspx?k=file type

and that worked too. Thanks for all your replys. Keep an ey out for me, I'll be post some more questions. Thanks again.