Application of Python regular grouping

Copy CodeThe code is as follows:

Import re
Text= ' V101_renow. Android.2.2.normal.1.alpha.apk? Imsi=460029353813976&mobile=&old_version=renow. Android.2.1.normal.1.alpha&channelid=3 '
m = Re.search (r "\w+_ (renow.*) \. ( APK|VIR|IPA) \? Imsi= (\d+) &mobile=&old_version= (. *) &channelid= (. *) ", text)
If M:
Print M.group (0), ' \ n ', M.group (1), ' \ n ', M.group (2), ' \ n ', M.group (3), ' \ n ', M.group (4), ' \ n ', M.group (5)
Else
print ' not match '

Here are the additions:

Groups are identified by the "(" and ")" meta-characters. "(" and ")" have many of the same meanings in mathematical expressions; together they make up a group of expressions within them. For example, you can repeat the contents of the group with a repeating limiter, like *, +,?, and {m,n}, for example (AB) * will match 0 or more duplicate "AB".

Example: If you do not introduce parentheses, add an expression as a group, which is group (0)

>>> Import re
>>> p=re.compile (' \d-\d-\d ')
>>> m=p.match (' 2-3-1 ')
>>> m.groups ()
()
>>> M.group ()
' 2-3-1 '
>>> M.group (1)
Traceback (most recent):
File " ", line 1, in
Indexerror:no such group

If you introduce parentheses, you can divide the above expression into 3 groups, as follows

>>> p=re.compile (' (\d)-(\d)-(\d) ')
>>> (' M=p.match ')
>>> M.group ()
' The '
>>> M.group (1)
' 1 '
>>> M.group (0,2,1)
(' 2-3-1 ', ' 2 ', ' 1 ')

You can also give names to individual groups, for example, to first array name

>>> p=re.compile (' (? P \d)-(\d)-(\d)
>>> (' M=p.match ')
>>> M.group (1)
' 1 '
>>> m.group (' first ')

' 1 '

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