Casing
WordNet
noun
(1) The enclosing frame around a door or window opening
"The casings had rotted away and had to be replaced"
(2) The outermost covering of a pneumatic tire
(3) The housing or outer covering of something
"The clock has a walnut case"
WiktionaryText
Noun
- That which encloses or encases.
- Some people like to split the casing of a sausage before cooking so it doesn't split, others don't.
- The collective states of upper and lower case letters.
- The replacement string should have the same casing as the matched text.