What is the diffrence between these three regular expressions
<p>What is the main difference between the following 3 regular expressions.  </p>

<p>1) <code>/^[^0-9]+$/</code></p>

<p>2)<code>/[^0-9]+/</code></p>

<p>3) <code>m/[^0-9]+/</code></p>

<p>I am really trying to understand this, since researching online has not helped me much I was hoping I could find some help here. </p>