4.2.2 Matching vs. Searching  Python offers two different
primitive operations based on regular expressions: match and
search. If you are accustomed to Perl's semantics, the search
operation is what you're looking for. See the search() function
and corresponding method of compiled regular expression objects.
Note that match may differ from search using a regular
expression beginning with "^": "^" matches only at the start of
the string, or in MULTILINE mode also immediately following a
newline. The ``match'' operation succeeds only if the pattern
matches at the start of the string regardless of mode, or at the
starting position given by the optional pos argument regardless
of whether a newline precedes it.  re.compile("a").match("ba",
1)           # succeeds re.compile("^a").search("ba", 1)
# fails; 'a' not at start re.compile("^a").search("\na", 1)
# fails; 'a' not at start re.compile("^a", re.M).search("\na",
1)  # succeeds re.compile("^a", re.M).search("ba", 1)   # fails;
no preceding \n  S