title: using pattern while loading csv file from s3 to snowflake
body: <p>below copy command is not working , please correct me if something wrong.
  <code>copy into mytable from  @mystage pattern='20.*csv.gz'</code></p>
  <p>here i am trying to load the files which are starts with <code>20</code>, there are mix of files which are having the name as <code>2021myfile.csv.gz, myfile202109.csv.gz</code>,   above command is not loading any files though there are files which starts with <code>20</code>.
  if i use pattern as <code>pattern='.*20.*csv.gz'`` it is taking all the files which is wrong, i need to load only the files that are starts with </code>20`.</p>
  <p>Thanks!</p>