sub_atom_icasechk/3

Availability:built-in

[semidet]sub_atom_icasechk(+Haystack, ?Start, +Needle)

True when Needle is a sub atom of Haystack starting at Start. The match is‘half case insensitive’, i.e., uppercase letters in Needle only match themselves, while lowercase letters in Needle match case insensitively. Start is the first 0-based offset inside Haystack where Needle matches.^{121This predicate replaces $apropos_match/2,
used by the help system, while extending it with locating the (first)
match and performing case insensitive prefix matching. We are still not
happy with the name and interface.}