no-useless-escape inside `new RegExp`

What version of ESLint are you using? v2.9.0 What parser (default, Babel-ESLint, etc.) are you using? standard Please show your full configuration:

      "ecmaVersion": 6,
      "extends": "standard",
      "installedESLint": true,
      "plugins": [
        "standard"
      ],
      "env": {
        "node": true,
        "browser": true
      },
      "rules": {
        "comma-style": [
          "error"
          , "first"
        ]
        , "one-var": ["error", {
          "var": "always",
          "let": "always",
          "const": "always"
        }]
        , "space-before-function-paren": ["error",
          {"anonymous": "always", "named": "never"}]
      }

What did you do? Please include the actual source code causing the issue.

`new RegExp('[^@]+@[^@]+\.[^@]+')`

What did you expect to happen? Do not get any warnings or error.

What actually happened? Please include the actual, raw output from ESLint. ESLint: Unnecessary escape character: \. (no-useless-escape)

[zhenyab]

@michaelficarra This regex to check e-mail and I want really escape the . because I want to check that . (dot) is exists inside the string. If I use the alternate syntax of regex like so:

/[^@]+@[^@]+\.[^@]+/

then I do not get this warning.

[ratracegrad]

I am using the RegExp to validate email addresses from http://emailregex.com/ which is

/^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/

this generates two no-useless-escape errors. Any suggestion on how to overcome this without removing this warning in the eslintrc file?

(edited by @not-an-aardvark to add a code block)