haystack

heinäsuova A mound, pile, or stack of stored hay.
puhekieltä A standing wave in a rapid.
puhekieltä The text string within which another string is searched for.
2010, Peter MacIntyre, PHP: The Good Parts (page 39)

Both of these functions will look through the haystack for the specified needle and, if they find it, will return the portion of the string from the beginning of the needle to the end of the haystack.