In T6653#167413, @maccath wrote:

For reference and the benefit of people Googling how to configure a script and regex linter, here is a full example (using sass-lint):

.arcconfig file:

{
"linters": {
    // snip ...
    "sass": {
          "type": "script-and-regex",
          "include": "(\\.scss$)",
          "script-and-regex.script": "sh -c 'sass-lint -v \"$0\" || true'",
          "script-and-regex.regex": "(^((?P<file>.+): line (?P<line>[0-9]+), col (?P<col>[0-9]+), (?P<severity>[^\\-]*) - (?P<message>.*) \\((?P<name>[a-z\\-]+)\\))$)m"
    }
}