title: Regex for exactly 6 char, first must be a letter
body: <p>What is the regex that matches these examples(6 characters, first is a letter, others are numbers):</p>
  
  <pre><code>u78945 - valid
  s56123 - valid
  456a12 - invalid
  78561d - invalid
  1234567 - invalid
  </code></pre>
  
  <p>i don't know if regular expressions are the same for every programming language. I need it for Regular Expression Validator control using VB ASP.NET.</p>