def get_index(lims: Lims, label: str) -> str:
"""Parse out the sequence from a reagent label"""
reagent_types = lims.get_reagent_types(name=label)
if len(reagent_types) > 1:
raise ValueError("Expecting at most one reagent type. Got ({}).".format(len(reagent_types)))
try:
reagent_type = reagent_types.pop()
except IndexError:
return ""
sequence = reagent_type.sequence
match = re.match(r"^.+ \((.+)\)$", label)
if match:
assert match.group(1) == sequence
return sequence
