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Дан фрагмент кода: TextFormField(   validator: (value) {     if (value =...

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Дан фрагмент кода:

TextFormField(

  validator: (value) {

    if (value == null ||

        !RegExp(r'^[\w\.-]+@[\w\.-]+\.\w+$').hasMatch(value)) {

      return 'Введите корректный email';

    }

    return null;

  },

);

Что проверяет данное регулярное выражение?

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