validationMessages not working for regex

 TextInput::make('discount_amount')
                ->regex('/^[0-9]+(\.[0-9]{2})$/i') 
                ->validationMessages([
                    'regex' => 'Must include a decimal point and at least one digit before and exactly 2 digits after the decimal point. (e.g. 100.00)'
                ])
                ->prefix('$')
                ->currencyMask(',', '.', 2)

 TextInput::make('discount_amount')
                ->regex('/^[0-9]+(\.[0-9]{2})$/i') 
                ->validationMessages([
                    'regex' => 'Must include a decimal point and at least one digit before and exactly 2 digits after the decimal point. (e.g. 100.00)'
                ])
                ->prefix('$')
                ->currencyMask(',', '.', 2)