python正则表达式模块re中search和match方法的区别

re.

search

(pattern, string, flags=0)¶
Scan through string looking for the first location where the regular expression pattern produces a match, and return a corresponding 

MatchObject

 instance.
Return 

None

 if no position in the string matches the pattern; note that this is different from finding a zero-length
match at some point in the string.

re.

match

(pattern, string, flags=0)
If zero or more characters at the beginning of string match the regular expression pattern, return a corresponding 

MatchObject

 instance.
Return 

None

 if the string does not match the pattern; note that this is different from a zero-length match.

For example:

>>> re.match("c", "abcdef")    # No match
>>> re.search("c", "abcdef")   # Match

https://docs.python.org/2/library/re.html#search-vs-match