Option localIdentRegExp doesn't work after upgraded to 6.0.

[latin-1]

• Operating System: Arch Linux
• Node Version: 16.4.2
• NPM Version: 7.17.0
• webpack Version: 5.45.1
• css-loader Version: 6.0.0

Expected Behavior

[1] placeholder should be replaced with the matched pattern.

Actual Behavior

[1] appears in generated class names.

Code

{
  loader: require.resolve("css-loader"),
  options: {
    modules: {
      localIdentName: "[1]__[local]__[hash:base64:8]",
      localIdentRegExp: /[/\\]([^/\\]+?)(?:\.module)?\.[^./\\]+$/,
    },
  },
},

How Do We Reproduce?

It seems that the localIdentRegExp option has never been used in the default getLocalIdent function. If that's the expected behavior, please note that in the changelog as a breaking change.

[alexander-akait]

Please update https://github.com/webpack-contrib/css-loader/releases/tag/v6.1.0