Python——RegularExpressions正則表達式

以下是學習goole PYTHON教程過程中的一些筆記。

'#' 後面的是輸出，希望你能從中獲取你想要的。

Regular Expressions

import re

match = re.search(pat, text)     #match object

match = re.search('iig', 'called piiig')

#<_sre,SRE_Match  object  at  0xf7f7c448>

match.group()     #'iig'

match = re.search('igs', 'called piig')     #

match.group()     #error

def Find(pat, text):

   match = re.search(pat,text)

    if match: print match.group()

    else: print 'not found'

Find('ig', 'called piiig')

#ig

Find('hello', 'called piiig')

#not found

Find('...g', 'called piiig')

#iiig

Find('x...g', 'called piiig')

#not found

Find('..gs', 'called piiig')

#not found

Find('..g', 'called piig much better: xyzg')

#iig

Find('x..g', 'called piiig much better: xyzg')

#zyzg

Find(r'c\.l', 'c.lled piiig much better:xyzgs')

#c.l

Find(r':\w\w\w', 'blah :cat blah blah')

#cat

Find(r'\d\d\d', 'blah :123xxx ')

#123

Find(r'\d\s\d\s\d', '1 2 3')

#1 2 3

Find(r'\d\s+\d\s+\d', '1       2        3')

#1       2        3

Find(r':\w+', 'blah blah :kitten blabh blah')

#:kitten

Find(r':\w+', 'blah blah :kitten123 blabh blah')

#:kitten123

Find(r':\w+', 'blah blah :kitten123& blabh blah')

#:kitten123

Find(r':.+', 'blah blah :kitten123& blabh blah')

#blah blah :kitten123& blabh blah

Find(r':\S+', 'blah blah :kitten123&a=123&yatta  blabh blah')

#kitten123&a=123&yatta

Find(r'\w+@\w+', 'blah [email protected] yatta @ ')

#p@gmail

Find(r'[\w.]+@\w+', 'blah hi.[email protected] yatta @ ')

#[email protected]m

Find(r'\w[\w.]+@\w+', 'blah .[email protected] yatta @ ')

#nick.p@gmail

Find(r'\w[\w.]+@[\w.]+', 'blah .[email protected] yatta @ ')

#[email protected]

m = re.search(r'([\w.]+)@([\w.]+)', 'blah [email protected] yatta @ ')

#<_sre.SRE_Match object at 0xF7F649F8>

m.group()

#'[email protected]'

m.group(1)

#'nick.p'

m.group(2)

#'gmail.com'

re.findall(r'[\w.]+@[\w.]+', 'blah [email protected] yatta foo@bar ')

#['[email protected]', 'foo@bar']

re.findall(r'([\w.]+)@([\w.]+)', 'blah [email protected] yatta foo@bar ')

#[('nick.p', 'gmail.com'), ('foo', 'bar')]

.     #(dot) any char

\w     #word char

\d     #digit

\s     #whitespace

\S     #non-whitespace

+     #1 or more

*     #0 or more