Fileupload Regular expression validation fails for certain file name in asp.net

Question

I am using fileupload control to upload file and at same time using regular expression for validating file name.

I want following file extension to be uploaded for .doc, .docx, .pdf i use following command to valid file name

ValidationExpression="[a-zA-Z\\].*(.doc|.DOC|.docx|.DOCX|.pdf|.PDF)$"

 <asp:FileUpload ID="FileUpload1" runat="server" CssClass="fileUpload" />
<asp:RequiredFieldValidator ID="ValidateF1" runat="server"  ErrorMessage="*" CssClass="row-validate"  ControlToValidate="FileUpload1"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="ValidateEx" runat="server"   ValidationExpression="[a-zA-Z\\].*(.doc|.DOC|.docx|.DOCX|.pdf|.PDF)$" ControlToValidate="FileUpload1" ValidationGroup="Careers" ErrorMessage="*"></asp:RegularExpressionValidator>

It fails to validate following file name

(K)+J01461+abced+high+En+(HR)(1).pdf I am not sure why it fails while it works for ABC_COMPANY_Privacy_v4.0_123456(5).pdf

Am i using the wrong validation expression. I want to allow any file name with extension as mentioned above.

Vignesh Kumar A · Accepted Answer · 2014-04-22 04:54:19Z

7

try this

ValidationExpression="^.*\.(doc|DOC|docx|DOCX|pdf|PDF)$"

answered Apr 22, 2014 at 4:54

Vignesh Kumar A

28.6k14 gold badges67 silver badges119 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Learning Over a year ago

If i only need to check for file extension then can i use @"\.(pdf|doc|docx)$" will it validate even file name which has multiple dots . for example file.name.pdf or file.name+abcd(1).docx or with spaces also

merlin2011 · Accepted Answer · 2014-04-22 05:00:11Z

2

It depends on entirely on what you consider a valid file name. Your current expression only captures file names with alphanumeric characters and the character \\.

From your two examples, it looks like you want to include ()+_, as well as multiple dots, so you can fix your expression by just adding those into the character class.

ValidationExpression="[_.a-zA-Z()+\\]*\.(doc|DOC|docx|DOCX|pdf|PDF)$"

If you want to include the space character as well, then just stick that in there too.

ValidationExpression="[_.a-zA-Z()+\\ ]*\.*(doc|DOC|docx|DOCX|pdf|PDF)$"

If you want to permit all possible characters before the extension, then using Vignesh's solution will certainly do it for you.

edited Apr 22, 2014 at 5:00

answered Apr 22, 2014 at 4:52

merlin2011

76.5k49 gold badges218 silver badges364 bronze badges

2 Comments

Learning Over a year ago

If i only need to check for file extension then can i use @"\.(pdf|doc|docx)$" will it validate even file name which has multiple dots . for example file.name.pdf or file.name+abcd(1).docx or with spaces also

merlin2011 Over a year ago

@KnowledgeSeeker, It depends on whether the Match function you are using is trying to match the entire string or only part of the string. If you try it and it works on one case, it should work in the general case also.

Collectives™ on Stack Overflow

Fileupload Regular expression validation fails for certain file name in asp.net

2 Answers 2

1 Comment

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related