title: How do I add my own Custom Regular Expressions to the RegularExpressionValidator in Visual Studio?
body: <p>I have a bunch of regular expressions which I commonly use on WebForms <code>RegularExpressionValidators</code> as the <code>ValidationExpression</code>.</p>
  
  <p>At the moment I need to copy paste the RegEx from similar controls or from a text file.
  Is there any way to extend the current list of Standard Expressions in the designer Drop Down (and can I delete patterns that I don't use like French phone number, French post code etc)?</p>
  
  <p><strong>Edit</strong> Hopefully this picture clarifies the issue</p>
  
  <p><img src="https://i.stack.imgur.com/D7sKn.png" alt="Regex"></p>