[Solved] RegularExpression Validator for File Extension Validation in ASP.Net FileUpload

born2ach...

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User: born2achie
Posted: on Feb 06, 2015 08:29 AM
Forum: Regular Expressions with ASP.Net
Answer: 1
Views: 14795

Hi,

using version asp.net 4.5

I am trying to validate file upload image validation and seems this expression is not working. The file name can be alphanumeric. extention can be .jpeg|.JPEG|.gif|.GIF|.png|.PNG|.JPG|.jpg|.bitmap|.BITMAP

tried below two expresssion and both are not working.

ValidationExpression="=/^(([a-zA-Z0-9]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.jpeg|.JPEG|.gif|.GIF|.png|.PNG|.JPG|.jpg|.bitmap|.BITMAP)$/"

ValidationExpression="([a-zA-Z\\].*(.jpg|.png|.bmp|.jpeg|.gif|.tif)$)"

Code:

<asp:RegularExpressionValidator ID="regexUpload" runat="server" ErrorMessage="Upload Images only."
                                    ValidationExpression="([a-zA-Z\\].*(.jpg|.png|.bmp|.jpeg|.gif|.tif)$)"
                                    ValidationGroup="Submit"
                                    ControlToValidate="fileUpload1" ForeColor="Red"> </asp:RegularExpressionValidator>

sample file for i checkd :

12345.jpg

asd123.jpg

asdfg/jpg

anyhelp please

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Mudassar

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ANSWER
User: Mudassar
Replied: on Feb 06, 2015 08:29 AM
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Try this one

<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:RegularExpressionValidator ValidationExpression="([a-zA-Z0-9\s_\\.\-:])+(.doc|.docx|.pdf)$"
    ControlToValidate="FileUpload1" runat="server" ErrorMessage="Please select a valid file." />
<asp:Button Text="Submit" runat="server" />

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[Solved] RegularExpression Validator for File Extension Validation in ASP.Net FileUpload

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