man FcStrStr (Fonctions bibliothèques) - locate UTF-8 substring
NAME
FcStrStr - locate UTF-8 substring
SYNOPSIS
#include <fontconfig.h> FcChar8 * FcStrStr (const char *s1, const char *s2);
DESCRIPTION
Returns the location of s2 in s1. Returns NULL if s2 is not present in s1. This test will operate properly with UTF8 encoded strings, although it does not check for well formed strings.
VERSION
Fontconfig version 2.3.2