regular expression to check file content type is .doc or not?

Question

When i use a file upload i use to check file contenttype with regular expressions... For ex

private bool IsImage(HttpPostedFile file)
    {
        if (file != null && Regex.IsMatch(file.ContentType, "image/\\S+") &&
          file.ContentLength > 0)
        {
            return true;
        }
        return false;
    }

This returns my file is an image or not... How to check it is a word(.doc/.docx) document or not using c#...

Answer 1

DOC's mimetype is:

• application/msword [official]
• application/doc
• appl/text
• application/vnd.msword
• application/vnd.ms-word
• application/winword
• application/word
• application/x-msw6
• application/x-msword

happy regex'ing

Edit:According to @Dan Diplo, you should also check for .docx's MIMEtypes

Answer 2

Take a look at regexblid A library with regular expression.

Also good to know, regexbuddy can be used to validate and test regular expressions.

Answer 3

if the content-type's are known (see Axarydax answer), why would you want to use regex?

Answer 4

For example using Axarydax answer: (so no docx mime check)

List<String> wordMimeTypes = new List<String>();
wordMimeTypes.Add("application/msword");
wordMimeTypes.Add("application/doc");
wordMimeTypes.Add("appl/text");
wordMimeTypes.Add("application/vnd.msword");
wordMimeTypes.Add("application/vnd.ms-word");
wordMimeTypes.Add("application/winword");
wordMimeTypes.Add("application/word");
wordMimeTypes.Add("application/x-msw6");
wordMimeTypes.Add("application/x-msword");
//etc...etc...

if (wordMimeTypes.Contains(file.ContentType))
{
    //word document
}
else
{
    //not a word document
}

More readable than Regex because regex will become a pain in the ass when trying to make a expression for a dozen of mime types

Answer 5

Gumbo is right, it might just be easier to check the file's extension.

Path.GetExtension(file.FileName)