The common Carex that we all used to grow was Carex oshimensis 'Evergold', which I always loved and still do. This one is very similar but the color of the variegation is heightened. 

Evergreen arching clumps absolutely glow with yellow striped variegation down the center of the glossy dark green blades. Dry shade is great for this one as is a pot -  where it will live forever.