Juozas

// 1. Insert before the_content() function:

private function cleanReplace($find, $replace, $string){
    for($i=0; $i < count($find); $i++)
        $string = substr_replace($string, $replace[$i], strpos($string, $find[$i]), strlen($find[$i]));
    return $string;
}

// 2. Insert after 'for ($i = 0; $i < count($matches); $i++) {}' loop in the_content() function:

$content = $this->cleanReplace($find,$replace,$content);

// 3. Instead of str_replace($find, $replace, $content) in the 'else { switch ( $this->options['position'] ) {... } }' statement simply use:

$content