mat-error example angular 8
Example: mat-form-field email validation
<input matInput placeholder="Favorite food" [(ngModel)]="enterEmail" name="myEmail" pattern="[a-zA-Z0-9.-_]{1,}@[a-zA-Z.-]{2,}[.]{1}[a-zA-Z]{2,}" required><input matInput placeholder="Favorite food" [(ngModel)]="enterEmail" name="myEmail" pattern="[a-zA-Z0-9.-_]{1,}@[a-zA-Z.-]{2,}[.]{1}[a-zA-Z]{2,}" required>