Added eslint-plugin-regexp as dev dependency

eslint.config.mjs

@@ -2,6 +2,7 @@ import js from '@eslint/js'
 import globals from 'globals'
 import json from '@eslint/json'
 import markdown from '@eslint/markdown'
+import * as regexp from 'eslint-plugin-regexp'
 import eslintPluginYml from 'eslint-plugin-yml'
 
 export default [
@@ -15,8 +16,9 @@ export default [
                 ipv4: 'readonly', marked: 'readonly', renderMathInElement: 'readonly'
             }
         },
+        plugins: { regexp },
         rules: {
-            ...js.configs.recommended.rules,
+            ...js.configs.recommended.rules, ...regexp.configs['flat/recommended'].rules,
             'indent': 'off', 'no-unexpected-multiline': 'off', 'key-spacing': 'off', // allow whitespace anywhere
             'quotes': ['error', 'single', { 'allowTemplateLiterals': true }], // enforce single quotes except backticks to avoid escaping quotes
             'comma-dangle': ['error', 'never'], // enforce no trailing commas in arrays or objects

package.json

@@ -22,6 +22,7 @@
     "@eslint/json": "^0.6.0",
     "@eslint/markdown": "^6.2.1",
     "eslint": "^9.14.0",
+    "eslint-plugin-regexp": "^2.6.0",
     "eslint-plugin-yml": "^1.15.0",
     "husky": "^9.1.6"
   }