Regular Expression for image?

Question

I have to upload images into DB using file up-loader. I have used the given below code, but it is not working. If I upload any pdf or doc file that also inserting into DB and the error message also displaying. I want to stop insertion if the file is not an image format. Help me to find a proper solution. Thank you.

ASPX :

<asp:FileUpload ID="PhotoUpload1" runat="server" ForeColor="#999999" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator6" runat="server" ErrorMessage="*jpeg,gif,png" ControlToValidate="PhotoUpload1" ForeColor="Red" 
ValidationExpression=".*\.([gG][iI][fF]|[jJ][pP][gG]|[jJ][pP][eE][gG]|[bB][mM][pP])$">
</asp:RegularExpressionValidator>


<asp:Button ID="btnSubmit" runat="server" OnClick="btnSubmit_Click" Text="Submit" />

you could use (?i) modifier to do a case insensitive match. — Avinash Raj
– Avinash Raj, Commented Dec 8, 2014 at 7:04

Emre Acar · Accepted Answer · 2014-12-08 07:39:09Z

5

This should work for jpg, png, gif and png.

UPDATED

/.*\.(gif|jpe?g|bmp|png)$/igm

You can check how it works here

edited Dec 8, 2014 at 7:39

answered Dec 8, 2014 at 7:03

Emre Acar

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4 Comments

Avinash Raj Over a year ago

[e?] matches e or ?

Emre Acar Over a year ago

@AvinashRaj did this to match both jpg and jpeg.

Avinash Raj Over a year ago

your regex matches jp?g also.

Emre Acar Over a year ago

@AvinashRaj no it doesn't.

Community · Accepted Answer · 2017-05-23 11:45:43Z

1

Try alternation "|" notation. And only list allowed file extensions (whitelist) like jpg,png.

<asp:FileUpload ID="PhotoUpload1" runat="server" ForeColor="#999999" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator6" runat="server" ErrorMessage="*jpeg,gif,png" ControlToValidate="PhotoUpload1" ForeColor="Red" 
ValidationExpression="(.*png$)|(.*jpg$)|(.*jpeg$)">
</asp:RegularExpressionValidator>

Asp.Net validation need to be validated on server side too.

    protected void btnSubmit_Click(object sender, EventArgs e)
    {
       //Note that there might be ServerSideValidation which evaluated to false.
       if (!Page.IsValid)  
         return;

       // Insert DB code here.
    }

edited May 23, 2017 at 11:45

CommunityBot

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answered Dec 8, 2014 at 7:02

Atilla Ozgur

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2 Comments

Vipin Over a year ago

I want insert only image file into DB. These answers are showing error message if the selected file is not a image format while clicking insert button, but the file also inserting into db

Vipin Over a year ago

The given below code is used to insert data into DB. QA_Form2TableAdapters.tbl_QA_InstallationTableAdapter qa; qa =new QA_Form2TableAdapters.tbl_QA_InstallationTableAdapter(); qa.InsertAll(ddlState.Text, ddlDistrict.Text,PhotoUpload1.FileBytes);

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