Remove unicode from url regex pattern

Remove unicodes `<U+200C><U+200B>` that appear in VIM editor.
Those unicodes are [zero-width non-joiner (U+200C)](http://en.wikipedia.org/wiki/Zero-width_non-joiner) and [zero-width space (U+200B)](http://en.wikipedia.org/wiki/Zero-width_space).

![screen shot 2014-06-13 at 10 34 37 am 1](https://cloud.githubusercontent.com/assets/2450760/3266077/55e735a8-f2a3-11e3-8fe1-dfdcb7c06905.png)