title: regexp_matches column without result being in array/curly braces
body: <p>I need to extract a # + 6 digits and place it in a new column using Postgres.</p>
  <p>I've worked this out, but it returns results with curly braces, which I gather is the results in an array.</p>
  <pre><code>SELECT regexp_matches(input, '(#+\d\d\d\d\d\d)') as output FROM table
  </code></pre>
  <p>I'd like to know how to output the results without the curly braces, and if there's a better way to write the regex as well. Thanks!</p>