如何检查文本字段(keyboardType: TextInputType.number)是否包含小于50的数字？

import 'dart:core';

bool containsNumberLessThan50(String text) {
  String pattern = r'[0-4]?[0-9]';
  RegExp regExp = RegExp(pattern);
  Iterable<Match> matches = regExp.allMatches(text);
  
  return matches.isNotEmpty;
}

void main() {
  String textFieldValue = '123456';
  bool containsLessThan50 = containsNumberLessThan50(textFieldValue);
  
  if (containsLessThan50) {
    print('文本字段包含小于50的数字');
  } else {
    print('文本字段不包含小于50的数字');
  }
}