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

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I am using the fileupload control to upload the file and to validate the filename at the same time I am using the expression.

I want to follow the file extension to upload for .doc, .docx, .pdf .Use the following command for the valid filename

validationXpress = "[a-zA -Z \\]. * (.doc | .doc | .docx | .docx | .pdf | .pdf) $" 

  & lt; Asp: fileUpload id = "FileUpload1" runat = "server" CssClass = "fileUpload" /> & Lt; Asp: RequiredFieldValidator id = "ValidateF1" runat = "server" error message = "*" CssClass = "row-valid" ControlToValidate = "FileUpload1" & gt; & Lt; / asp: RequiredFieldValidator & gt; & Lt; Asp: RegularExpressionValidator id = "ValidateEx" runat = "server" Validation Execution = "[a-zA-Z \\]. * (.doc | .doc | .docx | .docx | .pdf | .pdf) $" ControlToValidate = "FileUpload1" Validation Group = "Career" Error Message = "*" & gt; & Lt; / asp: RegularExpressionValidator & gt;   
 .pdf  I'm not sure why this fails when it works for  ABC_COMPANY_Privacy_v4.0_123456 (5) .pdf   
 I want to allow any file name with the extensions mentioned above.   
 
 
 try it  
  validation expression = "^. *. (Doctor | DOC | DOCX | PDF | PDF) $ "

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