patternRegExp static method

FormFieldValidator<String> patternRegExp(
  1. RegExp pattern,
  2. String errorMessage
)

Implementation

static FormFieldValidator<String> patternRegExp(
    RegExp pattern, String errorMessage) {
  return (value) {
    if (value!.isEmpty) return null;

    if (pattern.hasMatch(value))
      return null;
    else
      return errorMessage;
  };
}