{
    "first_name":   { "like": "[A-Za-z]+" },
    "last_name":    { "like": ["^[A-Za-z]+$"] },
    "middle_name":    { "like": ["^[a-z]+$", "i"] },
    "age": [{ "like": "^[0-9]+$" }],
    "empty_name":   { "like": "[A-Za-z]" },
    "missed_name":   { "like": "[A-Za-z]" }
}