def field_pattern data
  validation = data[:validation]
  validation
end

v = field_pattern validation: {type: 'length', length: '50-200'}
v[:type] # "length"
v[:length] # "50-200"

def field_pattern data
  $validation = data[:validation]
  $validation
end

$validation[:type] # "length"
$validation[:length] # "50-200"