Regular expression in jsp
<p>I need a regular expression which accepts both alphanumeric and also alphabets but not numerics alone, and special characters allowed are .(dot) and _(underscore).</p>

<p>Valid entries are  </p>

<p>1.ABC123de (alphanumeric- irrespective of the case)<br>
   2.   ABCDEfgh (only alphabets – irrespective of the case)<br>
   3.   Abc_.123 (only special characters allowed are _ and .)</p>

<p>Invalid entry:<code>666666</code>(numeric alone)</p>

<p>Thanks,
Balaji</p>
