Download FloodSel: flood-(de)select connected areas


This addon enables you to "flood-select" or deselect entire areas of selected/deselected elements.


First go to User Preferences->Addons and enable the FloodSel addon in the Mesh category.
Go to EditMode, select one or more areas of elements.  Invoke addon (button in Mesh Tools panel)
Click area with leftmouse to select/deselect and rightmouse to cancel.    Choose "Multiple" tickbox
if you want to do several operations in succession, and ENTER to keep changes.    Click tickbox
"Preselection" to preview selection/deselection when hovering mouse over areas.
View can be transformed during operation.

If you wish to hotkey FloodSel:
In the Input section of User Preferences at the bottom of the 3D View > Mesh section click 'Add New' button.
In the Operator Identifier box put 'mesh.floodsel'.
Assign a hotkey.
Save as Default (Optional).