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Locates a character or String within another String. By default, searches from the end of the String, but can also work backwards from a given index, allowing for the locating of all instances of the character or String.
string.lastIndexOf(val)
string.lastIndexOf(val, from)
string: a variable of type String
val: the value to search for - char or String
from: the index to work backwards from
The index of val within the String, or -1 if not found.
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