fixup! saveguard against without intl and more robust implementation

Author: BridgeAR

lib/internal/util/inspect.js

@@ -704,19 +704,30 @@ function highlightRegExp(regexpString) {
     } else if (ch === '|' || ch === '+' || ch === '*' || ch === '?' || ch === ',' || ch === '^' || ch === '$') {
       writeDepth(ch, 3, 1);
     } else if (ch === '{') {
-      write('{');
-      depth++;
       i++;
       let digits = '';
       while (i < regexpString.length && regexpString[i] >= '0' && regexpString[i] <= '9') {
         digits += regexpString[i++];
       }
       if (digits) {
+        write('{');
+        depth++;
         writeDepth(digits, 1, 0);
       }
-      if (i < regexpString.length && regexpString[i] === ',') {
-        write(',');
-        i++;
+      if (i < regexpString.length) {
+        if (regexpString[i] === ',') {
+          if (!digits) {
+            write('{');
+            depth++;
+          }
+          write(',');
+          i++;
+        } else if (!digits) {
+          depth += 1;
+          write('{');
+          depth -= 1;
+          continue;
+        }
       }
       let digits2 = '';
       while (i < regexpString.length && regexpString[i] >= '0' && regexpString[i] <= '9') {