Fixed string.regexp.coffee again

This was still broken after the fix in #174. This change simply copies the working regex.string.coffee from the literate tmLang.
![Broken](https://photos-6.dropbox.com/t/1/AACP-WN5bITFzA95RLsH2uvNZ-HV0FT8TbLpDLtsYKd6gA/12/14759638/png/1024x768/3/1411758000/0/2/Screenshot%202014-09-26%2010.03.42.png/GS2q4XiWI4rk5_mux7MhKqQ524qNzaQZd4SYXEtctvo)

![working](https://photos-5.dropbox.com/t/1/AAAOQBGh9Q0s0OFhg1m6954snA8qIunY9awM6uNVdLsOuw/12/14759638/png/1024x768/3/1411758000/0/2/Screenshot%202014-09-26%2010.11.41.png/6MaPzqTo6jIq7VVqkbnvXEugF_A0ngza39FtReD0oyI)