Invalid URL not detected in Regex pattern

I am working on my web development project where I encountered this error. The regex pattern below here is what I am using for my project. Also there is a list of invalid URLs that it cannot check in.

(https?://)?([\\da-z.-]+)\\.([a-z.]{2,6})[/\\w .-=?@$&!\-\/#/()]/?

Invalid URL: 

    http://a.b-c.de
    http://a.b-.co
    http://a.b--c.de/
    http://-error-.invalid/
    http:://www.com
    www.com
    W.ww.example.net
    www.example

I'm not able to invalidate the above list of URL. Can anyone help me to sort out this issue.