Man page - fcstrstrignorecase(3)
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Manual
FcStrStrIgnoreCase
NAMESYNOPSIS
DESCRIPTION
NAME
FcStrStrIgnoreCase - locate UTF-8 substring ignoring 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.