toMap method
Implementation
Map<String, dynamic> toMap() => {
if (regex != null) 'regex': regex,
if (patterns != null && patterns!.isNotEmpty) 'patterns': patterns,
if (hint != null) 'hint': hint,
if (stripNonDigits) 'stripNonDigits': stripNonDigits,
if (examples != null && examples!.isNotEmpty) 'examples': examples,
};