assoc-ignore-case

assoc-ignore-case is a compiled Lisp function in `subr.el'.

(assoc-ignore-case KEY ALIST)

This function is obsolete since 22.1;
use `assoc-string' instead.

Like `assoc', but ignores differences in case and text representation.
KEY must be a string. Upper-case and lower-case letters are treated as equal.
Unibyte strings are converted to multibyte for comparison.