Lab regex0: Hint on unnecessary parentheses

Signed-off-by: David A. Wheeler <[email protected]>

Author: david-a-wheeler

docs/labs/regex0.js

@@ -30,6 +30,13 @@ info =
         [ "C" ],
       ],
     },
+    {
+      present: String.raw`\(`,
+      text: "Parentheses are not necessary or clarifying in this regex. Prefer simpler regex expressions.",
+      examples: [
+        [ "(cat)" ],
+      ],
+    },
     {
       absent: "c",
       text: "If you are searching for \"cat\" you need to look for a \"c\"",
@@ -93,6 +100,14 @@ info =
         [ null, "A+B" ],
       ],
     },
+    {
+      present: String.raw`\(`,
+      index: 1,
+      text: "Parentheses are not necessary or clarifying in this regex. Prefer simpler regex expressions.",
+      examples: [
+        [ null, "(A+B+)" ],
+      ],
+    },
   ],
   expected: [
     'cat',