Yandex.Metrika - a tool to assess site traffic, visitor behavior analysis and the effectiveness of advertising.
Creating doYandexMetrika as a module based on the fact that it was possible to install the module only on certain pages (sections) of the site is running Joomla (see Menu Assignment in Module Manager of your CMS). The reason is to exclude unwanted pages from indexing by Yandex. For example, "My Cabinet" and similar non-public sections.
However, in a module incorporated an additional mechanism to exclude pages from the index by using regular expressions. By specifying a regular expression (in the notation of Perl), which is in coincidence with the (address) URI requested page sets the property to it "ut: 'noindex' (or ut: 0)" to counter object Ya.Metrika, you agree to prohibit the automatic sending of this page on your site for indexing.