validator pattern angular for number only
new FormControl({value: field.value}, [Validators.required, Validators.pattern(/^-?(0|[1-9]\d*)?$/)])
Source: stackoverflow.com
validators.pattern angular number
<input matInput (input)="validateInput(field)" [placeholder]="field.label" type="number" [formControlName]="field.id" [id]="field.id">
Source: stackoverflow.com