title: Regex for a letter as first char and four digits after
body: <p>I want to have a regex to validate a string starting with a letter and then digits, but the string length should be limited to 5 chars. </p>
  
  <p>Regex Expression I am using: </p>
  
  <pre><code>Validators.pattern('(.*?)[0-9]{4}')
  </code></pre>
  
  <p>Unfortunately, it does not give me validation message (error message) when the digit is more than 5. Could you please check my regex expression and tell me where I am doing wrong ?</p>