JQuery obtains the regular expression of the name of the uploaded file.

JQuery obtains the regular expression of the name of the uploaded file.

In Web development, file upload is often involved. When a file is uploaded, it is often necessary to verify the validity of the file. This is usually determined by a regular expression.

Method 1:

?

1 2 3 4 5 6 7

$ ('Input [type = "file"] '). on ('change', function (){ Var reg =/[^ \\\/] * [\\\/] +/g; // match the regular expression of the file name and suffix Var name = $ (this). val (). replace (reg ,''); Var postfix =/\. [^ \.] +/. exec (name); // get the file suffix Var text = name. substr (0, postfix ['index']); // obtain a name without a suffix // Detect uploaded files });

Method 2:

The following is an example. The variable file can be a string similar to a network path. In this example, the file address passed by the object name = file is obtained.

The Code is as follows:

Var file = jQuery ("input [name = 'file']"). val ()

Var filename = file. replace (/. * (\/| \\)/,"");

Var fileExt = (/[.]/. exec (filename ))? /[^.] + $/. Exec (filename. toLowerCase ()):'';

Filename

FileExt gets the suffix

Method 3:

Most of the regular expressions found on the Internet do not consider Chinese folders and Chinese file names.

Later, I wrote one by myself. After a long journey, I follow the naming rules in windows (the file name cannot contain the following characters ://*? | "<>), Finally completed a self-considered complete regular expression:

The Code is as follows:

([A-zA-Z] :) | (//) [^ ///*/? /|/: "<>] {1,255}) + /. ([j, J] [p, P] [g, G]) | ([g, G] [I, I] [f, F])

This expression is used to determine whether the type of the uploaded file is jpg or gif. I tested it myself. No matter how the folder and file name are named, it can be correctly determined as long as it can be found through windows file management.

The above is all the content of this article. I hope you will like it.