regex - 500 internal error on regular linux hosting for php

Solution:

Try the following rule.

RewriteEngine On
RewriteRule ^custom$ /contactus.php [L]
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Solution:

Invalid htaccess file

A Directory directive is invalid in a.htaccess file:

Description: Enclose a group of directives that apply only to the named file-system directory, sub-directories, and their contents

Context: server config, virtual host

Note that.htaccess is not a valid context. Similarly, AllowOverride is also invalid in a.htaccess file:

Description: Types of directives that are allowed in .htaccess files

Context: directory

Were it valid in a.htaccess file, it would defeat the purpose of what the directive is for.

Valid example

The entire contents of the.htaccess file to do what's in the question are:

<IfModule mod_rewrite.c>
    RewriteEngine on
    RewriteRule ^custom  contactus.php [NC,L]
</IfModule>
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I.e. If mod rewrite is enabled, apply that rewrite rule. Note that the syntax for rewrite flags is a comma separated list.