‘‘‘匹配原则，匹配的数据只能够接受字符串‘‘‘import rem=re.match(‘abc‘,‘abcdfe‘)print(m.group())o=re.match(‘[0-9][0-9]‘,‘567ab123c5‘)#[0-9]只代表一个数字,这样子代表匹配两个数字p=re.match(‘[0-9]{0,2}‘,‘3456ablc123d‘)#匹配【0-9】2位，一数字开头的，后面的不会被匹配,从头找，匹配到就返回i=re.match(‘[0-9]{10}‘,‘1234abc‘) #匹配10位,这样会匹配失败a=re.findall(‘[0-9]‘,‘a1d3f3d1a3d4f‘)b=re.findall(‘[0-9]{0,8}‘,‘a1d344444444444f3ggfgfgdfdfdd1a3d4f‘)#后面的表示{}表示匹配多少位，如果是8，表示匹配8位,表示0位到8位的数据都满足要求c=re.findall(‘[0-9]{8}‘,‘a1d344444444444f3ggfgfgdfdfdd1a3d4f‘)#要求必须是8位d=re.findall(‘.*‘,‘a1d344444444444f3ggfgfgdfdfdd1a3d4f‘)f=re.findall(‘.‘,‘‘‘a1d344444444444f3ggfgfgdfdfdd1a3d4f sdfdsdfdfdfdsf‘‘‘)#p匹配单行所有print(o)f=re.findall(‘ab*‘,"""a1d344444444444f3ggfgfgdfdfdd1a3d4f sdfdsdfdfdfbdsf""")#匹配多行,必须是以a开头，可以是a#可以是abG=re.findall(‘ab+‘,‘‘‘a1d344444444444f3ggfgfgdfdfdd1a3d4f sdfdsdfdfdfdsf‘‘‘)#匹配ab必须连在一起，匹配多个i=re.findall(‘ab+‘,‘‘‘ab1d34444444444ab4f3ggfgfgdfdfdd1a3d4f sdfdsdfdafdfdabcsf‘‘‘)#匹配ab必须连在一起，匹配多个H=re.findall(‘\S‘,‘‘‘a1d34444444444~!4f3ggfgfgd## fdfdd1a3d4f [email protected]#$fdsf‘‘‘)j=re.findall(‘~‘,‘‘‘a1d34444444444~!4f3ggfgfgd## fdfdd1a3d4f [email protected]#$fdsf‘‘‘)
k=re.search(‘\d+‘,‘‘‘a34d34444444444~!4f3ggfgfgd## fdfdd1a3d4f [email protected]#$46.5fdsf‘‘‘)l=re.sub(‘\d‘,‘G‘,‘‘‘a34d34444444444~!4f3ggfgfgd## fdfdd1a3d4f [email protected]#$46.5fdsf‘‘‘)#会把所有的数字替换成大写的Gm=re.sub(‘\d‘,‘G‘,‘‘‘a34d34444444444~!4f3ggfgfgd## fdfdd1a3d4f [email protected]#$46.5fdsf‘‘‘,count=2)# 找到前两个进行替换Q=re.sub(‘^\d‘,‘G‘,‘‘‘a34d34444444444~!4f3ggfgfgd## fdfdd1a3d4f [email protected]#$46.5fdsf‘‘‘,count=2)# 找到一数字开头，这次会失败n=re.search(‘^\d‘,‘‘‘3a34d34444444444~!4f3ggfgfgd## fdfdd1a3d4f [email protected]#$46.5fdsf‘‘‘)# 找到一数字开头，这次会成功N=re.search(‘^\d+$‘,‘‘‘a34d34444444444~!4f3ggfgfgd## fdfdd1a3d4f [email protected]#$46.5fdsf‘‘‘)# 找到一数字开头，以数字结尾print(o)print(‘ogoup‘,o.group())print(p)print(p.group())print(i)print(a)print(‘c‘,c)print(‘b‘,b)print(d)print(f)print(‘g‘,G)print(‘s‘,H)print(‘i‘,i)print(‘j‘,j)print(‘k‘,k)print(‘l‘,l)print(‘m‘,m)print(‘o‘,Q)print(‘n‘,n)print(‘N‘,N)
结果：
C:\Python34\python.exe "C:/Users/Admin/PycharmProjects/untitled1/第5 天/正交表达式.py"
abc
<_sre.SRE_Match object; span=(0, 2), match=‘56‘>
<_sre.SRE_Match object; span=(0, 2), match=‘56‘>
ogoup 56
<_sre.SRE_Match object; span=(0, 2), match=‘34‘>
34
[‘ab‘, ‘ab‘, ‘ab‘]
[‘1‘, ‘3‘, ‘3‘, ‘1‘, ‘3‘, ‘4‘]
c [‘34444444‘]
b [‘‘, ‘1‘, ‘‘, ‘34444444‘, ‘4444‘, ‘‘, ‘3‘, ‘‘, ‘‘, ‘‘, ‘‘, ‘‘, ‘‘, ‘‘, ‘‘, ‘‘, ‘‘, ‘‘, ‘‘, ‘1‘, ‘‘, ‘3‘, ‘‘, ‘4‘, ‘‘, ‘‘]
[‘a1d344444444444f3ggfgfgdfdfdd1a3d4f‘, ‘‘]
[‘a‘, ‘a‘]
g []
s [‘a‘, ‘1‘, ‘d‘, ‘3‘, ‘4‘, ‘4‘, ‘4‘, ‘4‘, ‘4‘, ‘4‘, ‘4‘, ‘4‘, ‘4‘, ‘4‘, ‘~‘, ‘!‘, ‘4‘, ‘f‘, ‘3‘, ‘g‘, ‘g‘, ‘f‘, ‘g‘, ‘f‘, ‘g‘, ‘d‘, ‘#‘, ‘#‘, ‘f‘, ‘d‘, ‘f‘, ‘d‘, ‘d‘, ‘1‘, ‘a‘, ‘3‘, ‘d‘, ‘4‘, ‘f‘, ‘s‘, ‘d‘, ‘f‘, ‘d‘, ‘s‘, ‘d‘, ‘f‘, ‘d‘, ‘f‘, ‘d‘, ‘f‘, ‘d‘, ‘f‘, ‘@‘, ‘#‘, ‘$‘, ‘f‘, ‘d‘, ‘s‘, ‘f‘]
i [‘ab‘, ‘ab‘, ‘ab‘]
j [‘~‘]
k <_sre.SRE_Match object; span=(1, 3), match=‘34‘>
l aGGdGGGGGGGGGGG~!GfGggfgfgd## fdfddGaGdGf
[email protected]#$GG.Gfdsf
m aGGd34444444444~!4f3ggfgfgd## fdfdd1a3d4f
[email protected]#$46.5fdsf
o a34d34444444444~!4f3ggfgfgd## fdfdd1a3d4f
[email protected]#$46.5fdsf
n <_sre.SRE_Match object; span=(0, 1), match=‘3‘>
N None
Process finished with exit code 0