match method Null safety

String? match(
  1. String? value,
  2. {String? message,
  3. required String pattern}
)

Check if the value matches the given RegExp pattern.

Implementation

static String? match(String? value, {String? message, required String pattern}) =>
    value == null || value.isEmpty || validations.matches(value, pattern) == true ? null : message ?? 'The pattern "$pattern" does not match the input';