no-invalid-regexp rule do not understand variable for flags

[eplouhinec]

Hi all, since few times, I have an issue with linting in a regex. It seems that variables are not allowed for flags.
Tell us about your environment

• ESLint Version: ?
• Node Version: v6.11.3
• npm Version: 3.10.10

What parser (default, Babel-ESLint, etc.) are you using? Babel-ESLint

Please show your full configuration:

Configuration

---
extends:
  - eslint:recommended
  - plugin:lodash/canonical
  - angular
plugins:
  - angular
  - lodash
  - compat
env:
  browser: true
  jasmine: true
# maybe one day
# parserOptions:
#   ecmaVersion: 6
rules:
  array-bracket-spacing:
    - 1
    - never
  arrow-body-style:
    - 1
    - 'as-needed'
  arrow-spacing:
    - 2
  semi:
    - 1
    - 'always'
  semi-spacing:
    - 1
  no-extra-parens:
    - 1
    - all
    - nestedBinaryExpressions: false
  quote-props:
    - 1
    - as-needed
  quotes:
    - 1
    - single
  no-whitespace-before-property:
    - 2
  object-curly-spacing:
    - 1
    - always
  key-spacing:
    - 1
  comma-dangle:
    - 2
    - 'only-multiline'
  angular/controller-name:
    - 2
    - /[A-Z].*Ctrl$/
  angular/controller-as-vm:
    - 2
    - 'ctrl'
  angular/no-http-callback:
    - 2
  angular/di-unused:
    - 1
  angular/no-service-method:
    - off
  lodash/chaining:
    - 1
    - 'always'
    - 3
  lodash/matches-shorthand:
    - 1
    - 'always'
    - 1
  lodash/matches-prop-shorthand:
    - 0
  lodash/prefer-constant:
    - off
  lodash/prefer-lodash-method:
    - 1
    - ignoreObjects:
      - 'angular.module'
      - 'elem.css'
      - 'cloneElement'
      - 'elem'
      - 'clone'
  lodash/identity-shorthand:
    - 1
  lodash/prefer-map:
    - 1
  lodash/prefer-some:
    - 1
  lodash/prefer-lodash-chain:
    - off
  lodash/prefer-reject:
    - 1
  lodash/chain-style:
    - off
  lodash/prefer-filter:
    - 1
  lodash/prefer-includes:
    - 1
  lodash/preferred-alias:
    - 1
  lodash/no-double-unwrap:
    - 1
  lodash/prefer-get:
    - 1
  lodash/no-extra-args:
    - 2
  lodash/collection-method-value:
    - 1
  lodash/unwrap:
    - 1
  lodash/prefer-is-nil:
    - 1
  lodash/prefer-noop:
    - 0
  compat/compat:
    - 1
globals:
  angular: true,
  module: true,
  inject: true,
  _: true,
  moment: true,
  require: true,
  jstz: true,
  $: true,
  protractor : true,
  browser: true,
  $$: true,
  element: true,
  by: true,
  Uint16Array: true

What did you do? Please include the actual source code causing the issue, as well as the command that you used to run ESLint.

var flags = 'ig';
var regex = new RegExp('([\\w_-]+)\\s*', flags);

gulp serve

What did you expect to happen?
No error on flags.

What actually happened? Please include the actual, raw output from ESLint.
error Invalid flags supplied to RegExp constructor 'null' no-invalid-regexp

[aladdin-add]

Thanks for the report! I can repro it.