fetch sub-string using regex : <p><code>string subject = "Re: Customer request [#11#]";</code></p>

<p>I want to fetch <strong>[#11#]</strong> from the above string. At run time instead of 11 there can be any number e.g. 12,13,14 etc. </p>

<p>Please suggest me appropriate Regex to fetch this output.</p>
