curl --request POST \
  --url https://api.example.com/api/custom-rules/test \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "pattern": "<string>",
  "sample": "<string>",
  "flags": []
}
'

{
  "matches": [],
  "count": 0
}