copyFiles does not support pattern match placeholder

[dontub]

In https://github.com/webpack-contrib/file-loader#placeholders there's the pattern match placeholder [N] documented:

The n-th match obtained from matching the current file name against the regExp.

I would expect that copyFiles would use the matches from pattern, though [N] is not replaced. For example in the following code

Encore.copyFiles({
     from: './assets/',
     to: '[path][0]',
     pattern: /.*/,
});

[0] should be replaced by the entire tested string, though the resulting filename is always [0].

[stof]

This is the doc for file-loader specifically. copyFiles is not abotu configuring the file-loader (as these files are precisely not loaded from your JS or CSS files, which is why they need explicit copying).

[dontub]

webpack-encore/index.js

Line 531 in 89929bb

* Where the files must be copied to. You can add all the

links to the file-loader documentation saying

You can add all the placeholders supported by the file-loader.

[Lyrkan]

We are indeed using the file-loader internally for that feature.

From what I understand that specific placeholder does not work because it requires the file-loader to be initialize with a regExp option, which is currently not the case (we only use the pattern option internally, it is not passed to the loader).

I think it wasn't available yet when I worked on copyFiles, but unless I'm missing something it could probably be added relatively easily.