Regular expressions in expect
<p>I just started learning expect scripting.I have been trying to extract the following from my output:</p>

<pre><code>core.4046140998.01.10.133211
</code></pre>

<p>with an expect script using the following command.can somebody please tell me where I am going wrong?I want to get to store this entire string i.e.( core.4046140998.01.10.133211*) in a variable and perform some action with it.</p>

<pre><code>expect -re {^(core)\.*} {puts $expect_out(0,string)}
</code></pre>

<p>Do i have to import any packages in expect to make this work?</p>