Add eslint-plugin-regexp (#142)

* Add eslint-plugin-regexp

This change is created by:
- the `npm i eslint-plugin-regexp` command
- a few additions to the `.eslintrc.js` file.

.eslintrc.js

@@ -16,6 +16,7 @@ module.exports = {
     "plugin:node/recommended-module",
     "plugin:jest/recommended",
     "plugin:jest/style",
+    "plugin:regexp/recommended",
     "prettier",
   ],
   rules: {
@@ -113,5 +114,8 @@ module.exports = {
     "prefer-spread": "error",
     "prefer-template": "error",
     "sort-imports": ["error", { allowSeparatedGroups: true }],
+
+    // Prefer code readability, e.g. `[0-9A-Za-z]`.
+    "regexp/prefer-d": "off",
   },
 };

package.json

@@ -28,7 +28,8 @@
     "eslint-config-prettier": "^8.3.0",
     "eslint-plugin-eslint-comments": "^3.2.0",
     "eslint-plugin-jest": "^24.3.6",
-    "eslint-plugin-node": "^11.1.0"
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-regexp": "^1.1.0"
   },
   "publishConfig": {
     "access": "public"