filename-reserved-regex 
Regular expression for matching reserved filename characters
On Unix-like systems / is reserved and <>:"/\|?* on Windows.
Install
$ npm install --save filename-reserved-regex
Usage
var filenameReservedRegex = require('filename-reserved-regex');
filenameReservedRegex().test('foo/bar');
//=> false
filenameReservedRegex().test('foo-bar');
//=> true
'foo/bar'.replace(filenameReservedRegex(), '!');
//=> foo!bar
License
MIT © Sindre Sorhus