       Otherwise, this is the name of a specific
       <span class="productname">PostgreSQL</span> database or a regular expression.
       Multiple database names and/or regular expressions can be supplied by
       separating them with commas.
      </p><p>
       If the database name starts with a slash (<code class="literal">/</code>), the
       remainder of the name is treated as a regular expression.
       (See <a class="xref" href="functions-matching.html#POSIX-SYNTAX-DETAILS" title="9.7.3.1. Reg