frmabc = this.fb.group({

    firstName : ['', [Validators.required , Validators.minLength(4) , Validators.maxLength(10)]],

    lastName : ['' , [Validators.required , Validators.minLength(4) , Validators.maxLength(10)]],

    email : ['' , [Validators.required, Validators.pattern('^[a-z0-9._%+-]+@[a-z0-9.-]+\\.[a-z]{2,4}$')]],

    age :['' , [Validators.required, Validators.pattern('^[0-9]+$'), Validators.max(100)]],

    password : ['', [Validators.required , Validators.minLength(4) , Validators.maxLength(10)]],

    confirmPassword : ['', [Validators.required , Validators.minLength(4) , Validators.maxLength(10)]]

  }, { validators: passwordMatchingValidatior });