Asp.net regular expression validator - validation expression
<p>I have a <code>textbox</code> which I will be using <code>regularexpressionvalidator</code> to check.</p>

<p>The <code>textbox</code> value must be <code>alphanumeric</code>.</p>

<p>or it can be <code>alphabetics</code>.</p>

<p>like..</p>

<pre><code>abc         -  Pass
abc123      -  Pass
123abc      -  Pass
abc123!@#   -  fail
123456      -  fail
!@#1234     -  fail
</code></pre>

<p>How to write a regular expression for that?</p>
