def get_mrca_idx_from_tip_labels(self, names=None, wildcard=None, regex=None):
if not any([names, wildcard, regex]):<EOL><INDENT>raise ToytreeError("<STR_LIT>")<EOL><DEDENT>node = fuzzy_match_tipnames(<EOL>self, names, wildcard, regex, True, False)<EOL>return node.idx<EOL>
Returns the node idx label of the most recent common ancestor node 
for the clade that includes the selected tips. Arguments can use fuzzy
name matching: a list of tip names, wildcard selector, or regex string.