Parsing parenthesis can cause bad multiplication

[nZac]

I ran into this recipe line that is giving false quantity numbers because of the Whole30

1 lb pork sausage (casings removed if necessary, sugar-free for Whole30)
​

def test_whole_thirty_issue():
    slicer = IngredientSlicer(
        "1 lb pork sausage (casings removed if necessary, sugar-free for whole30)",
        debug=True,
        enable_food_units=True,
    )
    parsed = slicer.to_json()
    assert parsed["quantity"] == "1" # FAILS: parsed["quanity"] == 30

The full output of parsed is this:

{'density': None,
 'dimensions': [],
 'food': 'pork sausage',
 'gram_weight': '13607.76',
 'ingredient': '1 lb pork sausage (casings removed if necessary, sugar-free '
               'for whole 30)',
 'is_required': True,
 'parenthesis_content': ['casings removed if necessary, sugar-free for whole '
                         '30'],
 'prep': [],
 'quantity': '30',
 'secondary_quantity': '1',
 'secondary_unit': None,
 'size_modifiers': [],
 'standardized_ingredient': '1 lb pork sausage',
 'standardized_secondary_unit': None,
 'standardized_unit': 'pound',
 'unit': 'lb'}

The problem seems to be here in _extract_quantities_only matching on any number in the string which is, unfortunately, to simple for this situation.

I can think of many things that could be in parenthesis that aren't related to quantity but I also can't think of a good way to differentiate (use 5 pieces) from (add 5 minutes).