18F/web-design-standards

{
  "label": "Alphanumeric",
  "hint": "For example, A1B 2C3",
  "id": "alphanumeric",
  "type": "text",
  "inputmode": "text",
  "placeholder": "___ ___",
  "pattern": "\\w\\d\\w \\d\\w\\d",
  "datacharset": "A#A #A#"
}