The input string, list or dictionary. If it is a list or a dictionary then the extraction will be done on all values.
The regex to use for extraction - only the groups in the regex will be extracted - or the zero group if none is defined.
Regex flags to use. Several flags can be used by concatenating them. Default: ism.
i = Case insensitive
s = Match . to any character, including newlines.
m = Multi-line matching, affecting ^ and $.