Only use negative look-ahead regexp with ruby 1.9. It's not available in 1.8.
Only use negative look-ahead regexp with ruby 1.9. It's not available in 1.8.

LightGuard/awestruct,awestruct/awestruct,LightGuard/awestruct,awestruct/awestruct,awestruct/awestruct,LightGuard/awestruct