title: regex to find the string with numbers or letters
body: <p>I have a requirement of a regular expression.</p>
  
  <p>1-4 number or 1-4 letter combo (required)."letter" can be any letter Unicode or Latin-1.
  Minimum 1 letter or number is required and the first number should not be 0.
  So i wrote the following regex.</p>
  
  <pre><code>([1-9\p{L}]{1}[0-9\p{L}]{0,3})
  </code></pre>
  
  <p>Will this work fine?</p>