test: enable @typescript-eslint/prefer-regexp-exec lint rule

The `@typescript-eslint/prefer-regexp-exec` rule is now enabled.
No code changes were required.

Author: clydin

.eslintrc.json

@@ -111,7 +111,6 @@
     "@typescript-eslint/no-unsafe-member-access": "off",
     "@typescript-eslint/no-unsafe-return": "off",
     "@typescript-eslint/no-unused-vars": "off",
-    "@typescript-eslint/prefer-regexp-exec": "off",
     "@typescript-eslint/require-await": "off",
     "@typescript-eslint/restrict-plus-operands": "off",
     "@typescript-eslint/restrict-template-expressions": "off",