title: How can I check if a Perl string contains letters?
body: <p>In Perl, what regex should I use to find if a string of characters has letters or not?
  Example of a string used: <code>Thu Jan  1 05:30:00 1970</code></p>
  
  <p>Would this be fine?</p>
  
  <pre><code>    if ($l =~ /[a-zA-Z]/)
   {
      print "string ";    
   }
   else
   {      
      print "number ";    
   }
  </code></pre>