'Is there any url regex validator that fits this criteria?

I need a url validator regex with this criteria:

  • protocol (HTTP, HTTPS) is optional. But if any protocol is given, it must be in the correct format, i.e. protocol:domain, or protocol://domain.
  • www is optional
  • it's possible to use direct IP address for this.

So based on the criteria, these should pass:

These should not pass:

  • hello
  • hello/world
  • abc://def.ghi
  • ftp:google.com

The closest regex I've found is from here:

^((?:.|\n)*?)((http:\/\/www\.|https:\/\/www\.|http:\/\/|https:\/\/)?[a-z0-9]+([\-\.]{1}[a-z0-9]+)([-A-Z0-9.]+)(/[-A-Z0-9+&@#/%=~_|!:,.;]*)?(\?[A-Z0-9+&@#/%=~_|!:‌​,.;]*)?)

But unfortunately, google.com doesn't pass. It needs to have www. as a prefix. Can you improve this regex so www. becomes optional?

regex


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