import re
'''
w : 匹配字母数字及下划线
W ：匹配非字母数字下划线
'''
print(re.findall('w','ab 12+- *&_')) #['a', 'b', '1', '2', '_']
print(re.findall('W','ab 12+- *&_')) #[' ', '\', '+', '-', ' ', '*', '&']
'''
s : 匹配任意空白字符，等价于[
f]
S : 匹配任意非空字符
'''
print(re.findall('s','ab
1
2 +- *&_')) #[' ', '
', ' ', ' ']
print(re.findall('S','ab
1
2 +- *&_')) #['a', 'b', '1', '2', '\', '+', '-', '*', '&', '_']
'''
d : 匹配任意数字，等价于[0-9]
D : 匹配任意非数字
'''
print(re.findall('d','ab
1
2 +-*&_')) #['1', '2']
print(re.findall('D','ab
1
2 +- *&_')) #['a', 'b', ' ', '
', '
', ' ', '\', '+', '-', ' ', '*', '&', '_']
print(re.findall('w_sb','exxx absx_sb123123wxx_sb,lxx_sb')) #['x_sb', 'x_sb', 'x_sb']
'''
A ：匹配字符串开始
'''
print(re.findall('Aalex','asdfalex is salexsb')) #[]
print(re.findall('Aalex','alex is salexsb')) #['alex']
'''
: 匹配字符串结束，如果是存在换行，只匹配到换行前的结束字符串
z : 匹配字符串结束
G ：匹配最好匹配完成的位置
^ : 匹配字符串的开头
$ : 匹配字符串的末尾
'''
print(re.findall('^alex','alex is salexb')) #['alex']
print(re.findall('sb','alexsb is sbalexbsb')) #['sb']
print(re.findall('sb$','alexsb is sbalexbsb')) #['sb']
print(re.findall('^ebn$','ebn1'))
'''
: 匹配一个换行符
: 匹配一个制表符
'''
print(re.findall('a
c','a
c a c alc')) #['a
c']
'''重复匹配
. ? * + {m,n} .*(贪婪模式) .*?（非贪婪模式）
'''
'''1, . 代表除了换行符外的任意一个字符'''
print(re.findall('a.c','abc alc aAc aaaaaa
c')) #['abc', 'alc', 'aAc']
print(re.findall('a.c','abc alc aAc aaaaaa
c',re.DOTALL)) #['abc', 'alc', 'aAc', 'a
c']
'''2，? : 代表左边那一个字符重复0次或1次，非贪婪模式'''
print(re.findall('ab?','a ab abb abbb abbbb abbbbbb')) #['a', 'ab', 'ab', 'ab', 'ab', 'ab']
'''3, *:代表左边那一个字符出现0次或无穷次'''
print(re.findall('ab*','a ab abb abbb abbbb abbbbbb albbbbbbbb')) #['a', 'ab', 'abb', 'abbb', 'abbbb', 'abbbbbb', 'a']
'''4,+：代表左边那一个字符出现1次或无穷次'''
print(re.findall('ab+','a ab abb abbb abbbb abbbbbb albbbbbbbb')) #['ab', 'abb', 'abbb', 'abbbb', 'abbbbbb']
'''5，{m,n}：代表左边那一个字符出现m次到n次'''
print(re.findall('ab?','a ab abb abbb abbbb abbbbbb albbbbbbbb'))
print(re.findall('ab{0,1}','a ab abb abbb abbbb abbbbbb albbbbbbbb')) #['a', 'ab', 'ab', 'ab', 'ab', 'ab', 'a']
print(re.findall('ab*','a ab abb abbb abbbb abbbbbb albbbbbbbb'))
print(re.findall('ab{0,}','a ab abb abbb abbbb abbbbbb albbbbbbbb')) #['a', 'ab', 'abb', 'abbb', 'abbbb', 'abbbbbb', 'a']
print(re.findall('ab+','a ab abb abbb abbbb abbbbbb albbbbbbbb'))
print(re.findall('ab{1,}','a ab abb abbb abbbb abbbbbb albbbbbbbb')) #['ab', 'abb', 'abbb', 'abbbb', 'abbbbbb']
print(re.findall('ab{1,3}','a ab abb abbb abbbb abbbbbb albbbbbbbb')) #['ab', 'abb', 'abbb', 'abbb', 'abbb']
'''6，.*：匹配任意长度，任意的字符======》贪婪匹配'''
print(re.findall('a.*b','ac a123c aaaaaacbb a *123) ()c asb dfsdjfdsf')) #['ac a123c aaaaaacbb a *123) ()c asb']
'''7，.*？: 非贪婪模式'''
print(re.findall('a.*?c','a123c454c')) #['a123c']
'''8,():分组'''
print(re.findall('(alex)_sb','alex_sb sdfsdggfealex_sb')) #['alex', 'alex']
print(re.findall(
'href="(.*?)"',
'<li><a id="blog_nav_sitehome" class="menu" href="http://www.cnblogs.com/">博客园</a></li>') #['http://www.cnblogs.com/']
)
# <li><a id="blog_nav_sitehome" class="menu" href="http://www.cnblogs.com/">博客园</a></li>
# href=".*?"
'''[]：匹配一个指定范围内的字符（这一个字符来自括号内定义的）'''
print(re.findall('a[0-9]c','alc a+c a2c a9c a11c a-c acc aAc')) #['a2c', 'a9c']
print(re.findall('a[0-9][0-9]c','alc a+c a2c a9c a11c a-c acc aAc')) #['a11c']
print(re.findall('a[0-9]+c','alc a+c a2c a9c a11c a-c acc aAc')) #['a2c', 'a9c', 'a11c']
'''当-需要被当中普通符号匹配时，只能放到[]的最左边或最右边'''
print(re.findall('a[-+*]c','alc a+c a2c a9c a11c a-c a*cc aAc')) #['a+c', 'a-c', 'a*c']
print(re.findall('a[a-zA-Z]c','alc a+c a2c a9c a11c a-c a*cc aAc')) #['alc', 'aAc']
'''[]内的^代表取反的意思'''
print(re.findall('a[^a-zA-Z]c','a c alc a+c allc a-c acc aAc')) #['alc', 'aAc']
print(re.findall('a[^0-9]+c','a c alc a8c a899c a+c allc a-c acc aAc')) #['a c alc', 'a+c allc a-c acc aAc']
print(re.findall('([a-z]+)_sb','egon alex_sb1132wxxxxxxxxxxxx_sb,lxx_sb')) #['alex', 'wxxxxxxxxxxxx', 'lxx']
'''|：a或者b'''
print(re.findall('compan(ies|y)','Too many companies have gone bankrupt, and the next one is my company')) #['ies', 'y']
'''(?:):代表取匹配成功的所有内容，而不仅仅只是括号内的内容'''
print(re.findall('compan(?:ies|y)','Too many companies have gone bankrupt, and the next one is my company'))
print(re.findall('alex|sb','alex sb sadfalexsbdfasdfegon alex sb egon')) #['alex', 'sb', 'alex', 'sb', 'alex', 'sb']
'''re模块的其他方法：'''
print(re.findall('alex|sb','123123 alex sb asdfasdfegon alex sb egon')) #['alex', 'sb', 'alex', 'sb']
print(re.search('alex|sb','123123sb alex sb asdfasdfegon alex sb egon').group()) #sb
print(re.search('^alex','123123 alex sb asdfasdfegon alex sb egon')) #None
print(re.search('^alex','alex sb sadfsadfasdfegon alex sb egon').group()) #alex
print(re.search('alex','alex sb sadfsadfasdfegon alex sb egon').group()) #alex
print(re.match('alex','alex sb sadfsadfasdfegon alex sb egon').group()) #alex
print(re.match('alex','123213 alex sb sadfsadfasdfegon alex sb egon')) #None
info='a:b:c:d'
print(info.split(':')) #['a', 'b', 'c', 'd']
print(re.split(':',info)) #['a', 'b', 'c', 'd']
info=r'get :a.txt3333/rwx'
print(re.split('[:\/]',info)) #['get ', 'a.txt', '3333', 'rwx']
print('egon is beutifull egon'.replace('egon','EGON',1)) #EGON is beutifull egon
print(re.sub('(.*?)(egon)(.*?)(egon)(.*?)',r'123EGON5','123 egon is beutifull egon 123')) #123 egon is beutifull EGON 123
# (123 )(egon)( is beutifull )(egon)( 123)
print(re.sub('(lqz)(.*?)(SB)',r'321',r'lqz is SB')) #SB is lqz
print(re.sub('([a-zA-Z]+)([^a-zA-Z]+([a-zA-Z]+)(^a-zA-Z)+)([a-zA-Z]+)',r'52341',r'lqzzzz123 + is SB')) #lqzzzz1 d 23 + sd32is SB
#(lqzzzz)(123+ )(is)( )(SB)
pattern=re.compile('alex')
print(pattern.findall('alex is alex alex')) #['alex', 'alex', 'alex']
print(pattern.findall('alexsadfsasdfdsfdsfsd is alex alex')) #['alex', 'alex', 'alex']