export class TestComponent {
  myForm: FormGroup;
  mobNumberPattern = "^[\+]?[(]?[0-9]{3}[)]?[-\s\.]?[0-9]{3}[-\s\.]?[0-9]{4,6}$";
  constructor(
    private frm : FormBuilder
  ) {
    this.myForm = this.frm.group({
      city: [''],
      street: [''],
      house:[''],
      phonesArr: this.frm.array([this.frm.control(['+7',Validators.required,Validators.pattern(this.mobNumberPattern)])]),
    })
  }
  addPhone() {
    (this.phones.push(this.frm.control('+7', [Validators.required,Validators.pattern(this.mobNumberPattern)])
    ))
  }
  get phones() {
    return this.myForm.controls['phonesArr'] as FormArray;
  }
}