money method

String? money(String? value, { String error = 'Valor inválido', double min = 1, int decimalLength = 2, })

use to validate money fields

TextFormField(
  autovalidateMode: AutovalidateMode.onUserInteraction,
  validator: (value) => Mask.validations.money(
    value,
    min: 100.0, // optional field
  ),
),

------------ or ------------

TextFormField(
  autovalidateMode: AutovalidateMode.onUserInteraction,
  validator: Mask.validations.money,
),

Implementation

String? money(
  String? value, {
  String error = 'Valor inválido',
  double min = 1,
  int decimalLength = 2,
}) {
  String formatted = (value ?? "").replaceAll(RegExp(r'\D'), '');
  double moneyValue = double.tryParse(formatted) ?? 0;
  double money = moneyValue / pow(10, decimalLength);

  if (money < min) return error;
  return null;
}