Provided by: libfontconfig1-dev_2.13.1-2ubuntu3_amd64 bug

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.

Fontconfig 2.13.1                                 06 April 2020                            FcStrStrIgnoreCase(3)