FcStrStrIgnoreCase (3) - Linux Manuals
FcStrStrIgnoreCase: locate UTF-8 substring ignoring ASCII case
NAME
FcStrStrIgnoreCase - locate UTF-8 substring ignoring ASCII case
SYNOPSIS
#include <fontconfig/fontconfig.h>
FcChar8 * FcStrStrIgnoreCase (const FcChar8 *s1, const FcChar8 *s2);
DESCRIPTION
Returns the location of s2 in s1, ignoring case. Returns NULL if s2 is not present in s1. This test is case-insensitive for all proper UTF-8 encoded strings.