title: Parsing error: Invalid regular expression: /\p{Lu}/: Invalid escape (Unicode general category properties)
body: <p>ESLint 7.0.0 appears to have a problem with <a href="https://unicode.org/reports/tr18/#General_Category_Property" rel="nofollow noreferrer">Unicode general category properties</a> in regular expressions.</p>
  
  <p>In one file, I'm getting this error message:</p>
  
  <pre><code>Parsing error: Invalid regular expression: /\p{Lu}/: Invalid escape
  </code></pre>
  
  <p>I'm getting it in other files as well, but this is the most simple expression on which I'm getting it. </p>
  
  <p>It's a valid expression. Works just fine when I run the code. But it's breaking my ESLint run.</p>
  
  <p>What setting do I use to get ESLint to accept these expressions?</p>