title: Regex : string must contain a-z and A-Z and 0-9
body: <p>I'm using a stored procedure to validate the input parameter. The input parameter must contain a-z and A-Z and 0-9.<br>
  for Example:<br>
  <code>aS78fhE0</code> -> Correct<br>
  <code>76AfbRZt</code> -> Correct<br>
  <code>76afbrzt</code> -> Incorrect(doesn't contain Upper Case A-Z)<br>
  <code>asAfbRZt</code> -> Incorrect(doesn't contain Numeric 0-9)<br>
  <code>4QA53RZJ</code> -> Incorrect(doesn't contain Lower Case a-z)<br>
  <br>
  what Regular Expression that can validate the input parameter like above example,.?<br><br>
  Many Thanks,<br>Praditha
  <br><br>
  <strong>UPDATE</strong><br>Others character except Alphanumeric are not allowed<br>I'm Using MySQL version 5</p>