title: Regular expression for one Alphabet and many numbers
body: <p>I need a regular expression that check my string contains one alphabet+many digits.Eg, A546456 or B456 or N455,asp.net </p>
  
  <p>I have tried  </p>
  
  <pre><code>^[a-z|A-Z|]+[a-z|A-Z|0-9]+[0-9]*
  </code></pre>
  
  <p>and </p>
  
  <pre><code>[a-zA-Z0-9]+
  </code></pre>