Regular Expression For Excluding File Types .exe And .js

I am using JQuery File upload plugin, for giving value to the option accept files I need the regular expression which will tells what are the file types to be restricted. I need to

Solution 1:

This will exclude .js and .exe at the end of the string, but allow anything else:

/^[^.]+$|\.(?!(js|exe)$)([^.]+$)/

Broken down:

1. ^[^.]+$ matches any string with no dots
2. \.(?!(js|exe)$)([^.]+$) matches a dot only if it is not followed by js or exe at the end of the string.

The following are allowed:

• something.js.notjs
• somethingelse.exee
• /something.js/foo

The following are not allowed:

• jquery.js
• outlook.exe

Note: excluding certain file extensions is not a substitute for security, and even if it were JS and EXE files would not be a comprehensive blacklist. If your purpose in excluding certain extensions is to protect your server or your users, consider a white list of extensions and a thorough validation of file data after upload.

Solution 2:

You're looking to use the (?!pattern) syntax. Also, while stating what you want to match, you aren't stating what should match. So this should do the trick:

(\.|\/)(?!exe|js).*$

This is saying "Match anything that's a dot (.) as long as it's not followed by 'exe' or 'js', and then match whatever you want after that."

Solution 3:

I do not know this work or not but 99% this will work for you to exclude this exe or js extension use following pattern

/\.(exe|js)$/ig

Following code give you TRUE when file is on your blacklist. Otherwise give you FALSE

var result = /\.(exe|js)$/ig.test(filename);

Hope this help you!