title: How to exclude spaces when using ValidationExpression in vb.net
body: <p>I want to exclude spaces when validating a textbox in vb.net.
  Here is the current ValidationExpressopn value:</p>
  
  <p>ValidationExpression="^([a-zA-Z0-9_-.\']+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|(([a-zA-Z0-9-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$" /></p>
  
  <p>When user inputs space in textbox, I dont want that to render as error.</p>
  
  <p>Example: I include spaces after "1@test.com   "</p>
  
  <p>This should not be treater as incorrect data in the textbox.</p>
  
  <p>Any ideas?</p>