I want to parse special flags that begins with a dash and contains a single digit to mean compression levels for my zip like compression tool.
Right now I need to handle this with a special check inside a callback for positional arguments.
I would like to have something like:
opts.add_flag_fallback("-<digit>", [&](const char d) {
compressionLevel = d - '0';
}, "Set compression level (0-9)");
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