What character is used to enclose modifiers in the FIND function?

In the FIND function within SAS, quotes are employed to enclose any string that you want to search for within another string. This is because the FIND function looks for a substring within a larger string and using quotes around the substring clearly indicates to the function what specific value you are trying to locate. By enclosing the modifier (the substring) in quotes, you signal to SAS that this is a literal string to be matched against the target string.

The other choices do not serve this purpose within the context of the FIND function. For instance, brackets are often used in other programming contexts to denote lists or arrays, while parentheses may be used for organizing expressions or clarifying order of operations, but not specifically for enclosing search strings in this case. Asterisks are frequently used in SAS for wildcard matching in other contexts, but they are not relevant in the FIND function as a means of enclosing substrings. This makes the use of quotes the defining characteristic that correctly employs the FIND function for substring searching.