title: Is there a way to change only certain parentheses to the underbar?
body: <p>I want to change to</p>
  <blockquote>
  <p>[number] -&gt; _number_</p>
  </blockquote>
  <p>and leave the rest as it is.
  In the example below, only three were created, but there are more than 100 in one line in my script.</p>
  <p><strong>before</strong></p>
  <pre><code>[list [get_pins [change $ate2[7]]] [get_pins $ut2_mi[24]]]  -to [get_pins $abc[2]]
  </code></pre>
  <p><strong>after</strong></p>
  <pre><code>[list [get_pins [change $ate2_7_]] [get_pins $ut2_mi_24_]]  -to [get_pins $abc_2_]]
  </code></pre>