A shell casing; a tire casing.
- A cleaned intestine as of cattle, a plastic membrane, etc., used to encase processed meats.
- The supporting framework of a pneumatic rubber tire exclusive of an inner tube and tread; carcass.
- A piece of heavy steel pipe used to line a borehole or well, esp. an oil or gas well.
The replacement string should have the same casing as the matched text.