How to use python regular expressions

Python's regular expression is supported by the re module.

Three matching functions

match: only matches the regular expression from the beginning of the string, and returns matchobject if the match is successful, otherwise it returns none;

re.match(pattern, string, flags=0) ##flags flag bit, used to control the matching method of regular expressions , such as: whether to be case-sensitive, multi-line matching, etc.

search: Try to match all the strings of the string with the regular expression. If all the strings do not match successfully, return none, otherwise return matchobject; (re.search is equivalent to perl Default behavior)

findall method returns a list of all matching expressions;

Use

mypatten = re.compile("Rule") ##Define matching rules

myresult = mypatten.match("String") ##Matching results

if myresult:

　print myresult.group()##You can fill in the numbers in the brackets or name the group (? Pregular expression)#name is a legal identifier

##search is the same as match

mypatten = re.compile("Rule") ##Define matching rules

myresult = mypatten. findall("string") ##Returns a list. If there are groups, it returns a two-dimensional list

##if myresult:

print

myresult.group()

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