How to use the compile function of Python

Today, I would like to share with you the relevant knowledge points about how to use the compile function of Python. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article.

Example

> import re

> pattern = re.compile (r'([a murz] +) ([a murz] +)', re.I) # re.I means ignore case

> m = pattern.match ('Hello World Wide Web')

> print (m) # matches successfully and returns a Match object > m.group (0) # returns the entire substring 'Hello World'

> m.span (0) # returns the index of the entire substring that matches successfully (0,11)

> m.group (1) # returns the first packet matching substring 'Hello'

> m.span (1) # returns the index (0,5) of the first packet matching successful substring

> m.group (2) # returns the second packet matching substring 'World'

> m.span (2) # returns the substring index of the second packet with a successful match (6,11)

> m.groups () # is equivalent to (m.group (1), m.group (2),...) ('Hello',' World')

> m.group (3) # there is no third grouping

Traceback (most recent call last):

File "", line 1, in

IndexError: no such group

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