gruntjs/grunt-contrib-concat — pull request #66 by JuhQ (2014-02-10 23:05:07+00:00)
Title: Improved stripBanners functionality

Line and block comments should be removed with these fixes.

Line comment removing is really slow on large files, hopefully someone finds a solution here.
I moved the line comment removing away from the array to a separate regex so that the global flag would not mess up the file. Some funky results otherwise.