How to use Material-ui@next TextField error props

Using a react component state, one can store the TextField value and use that as an indicator for an error. Material-UI exposes the error and helperText props to display an error interactively.

Take a look at the following example:

<TextField
  value={this.state.text}
  onChange={event => this.setState({ text: event.target.value })}
  error={text === ""}
  helperText={text === "" ? 'Empty field!' : ' '}
/>

I add an example that does not shows an error when the value is empty and validates a regular expression (MAC Address).

<TextField id="macAddress" label="MAC Address" name="macAddress"
  value={this.state.macAddress}
  onChange={this.handleChange}
  error={this.state.macAddress !== "" && !this.state.macAddress.match("^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$")}
  helperText={this.state.macAddress !== "" && !this.state.macAddress.match("^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$") ? 'MAC Address must be a 6-bytes string.' : ' '}
/>