FcStrStrIgnoreCase − locate UTF‐8 substring ignoring ASCII

#include <fontconfig.h>

FcChar8 * FcStrStrIgnoreCase (const char *s1, const char

     Returns the location of s2 in s1, ignoring ASCII case.
Returns NULL if s2 is not present in s1.  This test is case‐
insensitive in the ASCII range and will operate properly
with UTF8 encoded strings, although it does not check for
well formed strings.

     Fontconfig version 2.4.2