validateAlphanumeric function

void validateAlphanumeric(
  1. String value,
  2. String fieldName
)

Validates if a string is alphanumeric.

Implementation

void validateAlphanumeric(String value, String fieldName) {
  if (!RegExp(r'^[a-zA-Z0-9]+$').hasMatch(value)) {
    throw Exception('Invalid $fieldName. It should be alphanumeric.');
  }
}