title: Unicode characters in Regex
body: <p>I have a regular expression: </p>
  
  <pre><code>return Regex.IsMatch(_customer.FirstName, @"^[A-Za-z][A-Za-z0-9@#%&amp;\'\-\s\.\,*]*$");
  </code></pre>
  
  <p>Now, some of the customers have a fada over a vowel in their surname or firstname like the following: <code>Brendán</code> </p>
  
  <p>Note the fada over the a which you can get by holding down <kbd>alt</kbd>, <kbd>ctrl</kbd> and then pressing <kbd>a</kbd>.</p>
  
  <p>I have tried adding these characters into the regular expression but I get an error when the program tries to compile.</p>
  
  <p>The only way I can allow the user to enter such a character with a a fada is to remove the regular expression completely which means the user can enter anything they want.</p>
  
  <p>Is there any way to use the above expression and somehow allow the following characters?</p>
  
  <pre><code>á
  é
  í
  ó
  ú
  </code></pre>