this.sampleStringErrorMsg = 'The sample is not valid:n' +
            '- The key and key value are required in the sample.n ' +
            '- The delimiter must be entered when the sample contains several key-value pairs.n' +
            '- The delimiter must not be equal to the key or key value.n';

this.snackBar.open(this.sampleStringErrorMsg, null, {
  verticalPosition: 'top'
});

this.snackBar.openFromComponent(SnackbarErrorComponent, {
    verticalPosition: 'top'
  });

constructor(@Inject(MAT_SNACK_BAR_DATA) public data: any) { }

this.snackBar.openFromComponent(SnackbarErrorComponent, {
    verticalPosition: 'top',
    data: <YOUR_DATA_HERE>
  });