Expand region increases the selected region by semantic units. Just keep pressing the key until it selects what you want.
Global Key-binding available by default:
C-= : Expands on the current region.
F9  : Selects the current string.

URL : https://github.com/magnars/expand-region.el
Merge pull request #9 from firesofmay/patch-2

Expand region increases the selected region by semantic units.