Excluding some css files with test regex

[intelcoder]

What is the current behavior?
I wanted to exclude some of the css files which can be many depends on config file.
So I tried to pass the regex to test
test: /^(?!bear|cat).*\.css$/
However, it still include bear.css and cat.css which is not even required in js

What is the expected behavior?
I am expecting this test check regex and retrieve only matched ones

[michael-ciniawsky]

{
   test: /\.css$/,
   use: [ 'css-loader', ... ],
   include: '{RegExp}', // <=
   exclude: '{RegExp}' // <=
}

[intelcoder]

Thanks for answer. I used include with regex. However, it still includes everything.
if I try this in https://regex101.com/. The regex below is valid.
^((?!cat|bear).*.css)$

loaders: [
      {
        test: /\.css$/,
        exclude: /react-flexbox-grid/,
        include: /^((?!bear|cat).*\.css)$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: [
            {
              loader: 'css-loader',
              query: {
                modules: true,
                minimize: false,
                // localIdentName: '[hash:base64:5]'
              }
            },
            {
              loader: 'postcss-loader',
              options: {
          
                plugins: (loader) => [
                  require('postcss-modules-values')(),
                  require('postcss-nested')(),
                  require('autoprefixer')(),
                ]
              }
            }
          ]
        })
      },
      //
    ]

Am I still configuring wrong way ?