username static method

String? username(
  1. String? value, {
  2. String errorMsg = 'Enter a valid username',
})

🧍 Username Validator

Implementation

static String? username(
  String? value, {
  String errorMsg = 'Enter a valid username',
}) {
  if (value == null || value.trim().isEmpty) return 'Username is required';
  if (value.trim().length < 3) {
    return 'Username must be at least 3 characters';
  }
  return null;
}