title: How to find and replace a particular character but only if it is in quotes?
body: <p>Problem:
  I have thousands of documents which contains a specific character I don't want. E.g. the character <code>a</code>. These documents contain a variety of characters, but the <code>a</code>'s I want to replace are inside double quotes or single quotes. </p>
  
  <p>I would like to find and replace them, and I thought using Regex would be needed. I am using VSCode, but I'm open to any suggestions. </p>
  
  <p>My attempt:
  I was able to find the following regex to match for a specific string containing the values inside the <code>()</code>.</p>
  
  <pre><code>".*?(r).*?"
  </code></pre>
  
  <p>However, this only highlights the entire quote. I want to highlight the character only.</p>
  
  <p>Any solution, perhaps outside of regex, is welcome.</p>
  
  <p>Example outcomes:
  Given, the character is <code>a</code>, find replace to <code>b</code></p>
  
  <p><code>Somebody once told me "apples" are good for you</code> => <code>Somebody once told me "bpples" are good for you</code></p>
  
  <p><code>"Aardvarks" make good kebabs</code> => <code>"Abrdvbrks" make good kebabs</code></p>
  
  <p><code>The boy said "aaah!" when his mom told him he was eating aardvark</code> => <code>The boy said "bbbh!" when his mom told him he was eating aardvark</code></p>