Named capture groups - groups array not correct when using literal expressions

[kurt-genus]

Bug Report

Current Behavior
If I have mutliple literal regex's, it seems to interfere with the groups array on the exec results.

Input Code

const regex1=/(?<alpha>\w+):(?<bravo>\d+)/;
const regex2=/(?<alpha>\w+):(?<bravo>[a-z]+):(?<charlie>\w+)/;

let foo='foo:abc:bar';
let result;

if(result= regex1.exec( foo ) ) {
  console.log( result);
} else if( result=regex2.exec(foo) ) {
  console.log( result );
}

Expected behavior/code
If you look at the code above, what I expect in the log is for the groups array to contain an entry for "charlie" because that is the expression which matched. However, this is what I see instead:

(4) ["foo:abc:bar", "foo", "abc", "bar", index: 0, input: "foo:abc:bar", groups: {…}]
0: "foo:abc:bar"
1: "foo"
2: "abc"
3: "bar"
groups: {alpha: "foo", bravo: "abc"}
index: 0
input: "foo:abc:bar"
length: 4
proto: Array(0)

result.groups.charlie is undefined even though result[3] is set to "bar".

Babel Configuration (.babelrc, package.json, cli command)

{
  "name": "genus-player",
  "version": "1.0.0",
  "description": "Media Player component for Genus MediaUpshot assets",
  "main": "dist/index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "webpack-dev-server --mode development",
    "build": "babel src -d dist --copy-files",
    "install": "babel src -d dist --copy-files"
  },
  "author": "",
  "license": "ISC",
  "peerDependencies": {
    "prop-types": "^15.7.2",
    "react": "^16.8.4",
    "react-dom": "^16.8.4",
    "react-pdf-js": "^4.0.2",
    "video.js": "^7.4.1"
  },
  "devDependencies": {
    "@babel/cli": "^7.2.3",
    "@babel/core": "^7.3.4",
    "@babel/plugin-proposal-class-properties": "^7.3.4",
    "@babel/preset-env": "^7.3.4",
    "@babel/preset-react": "^7.0.0",
    "@babel/register": "^7.0.0",
    "babel-loader": "^8.0.5",
    "css-loader": "^2.1.1",
    "html-webpack-plugin": "^3.2.0",
    "prop-types": "^15.7.2",
    "react": "^16.8.4",
    "react-dom": "^16.8.4",
    "react-pdf-js": "^4.0.2",
    "script-ext-html-webpack-plugin": "^2.1.3",
    "style-loader": "^0.23.1",
    "video.js": "^7.4.1",
    "webpack": "^4.29.6",
    "webpack-cli": "^3.2.3",
    "webpack-dev-server": "^3.2.1"
  }
}

Environment

• Babel version(s): [e.g. v6.0.0, v7.0.0-beta.34]
• Node/npm version:6.9
• OS: linux
• Monorepo: [e.g. yes/no/Lerna]
• How you are using Babel: [e.g. cli, register, loader]

Possible Solution

Additional context/Screenshots
Add any other context about the problem here. If applicable, add screenshots to help explain.

[babel-bot]

Hey @kurt-genus! We really appreciate you taking the time to report an issue. The collaborators
on this project attempt to help as many people as possible, but we're a limited number of volunteers,
so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack
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[nicolo-ribaudo]

What is your Babel config and what is the generated output?

[kurt-genus]

.babelrc

{
    "presets": ["@babel/env", "@babel/react"],
    "plugins": ["@babel/plugin-proposal-class-properties"]
}

The generated output contains more than just this issue, I'll see if I can't get a complete working version.

But here is what I think is the relevant portion :

 var regex1 = _wrapRegExp(/(\w+):(\d+)/, {
        alpha: 1,
        bravo: 2
      });

      var regex2 = _wrapRegExp(/(\w+):([a-z]+):(\w+)/, {
        alpha: 1,
        bravo: 2,
        charlie: 3
      });

      var foo = 'foo:abc:bar';
      var result;

      if (result = regex1.exec(foo)) {
        console.log(result);
      } else if (result = regex2.exec(foo)) {
        console.log(result);
      }