正则表达式练习题2

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1、匹配一行文字中的所有开头的字母内容

#coding=utf-8

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import re

s="i love you not because of who you are,but because of who i am when i am with you"

content=re.findall(r"bw",s)

print content

c:Python27Scripts>python task_test.py

[‘i‘,‘l‘,‘y‘,‘n‘,‘b‘,‘o‘,‘w‘,‘a‘,‘i‘,‘y‘]

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2、匹配一行文字中的所有开头的数字内容

s="i love you not because 12sd 34er 56df e4 54434"

content=re.findall(r"bd",sans-serif; background-color: #faf7ef;">c:Python27Scripts>python task_test.py

[‘1‘,‘3‘,‘5‘,‘5‘]

3、匹配一行文字中的所有开头的数字内容或数字内容

>>> print re.match(r"w+","123sdf").group()

123sdf

4、 只匹配包含字母和数字的行

s="i love you not becausen12sd 34er 56ndf e4 54434"

content=re.findall(r"w+",s,re.M)

5、写一个正则表达式，使其能同时识别下面所有的字符串：‘bat‘,‘bit‘,‘but‘,‘hat‘,‘hit‘,‘hut‘

s="‘bat‘,‘hut"

content=re.findall(r"..t",sans-serif; background-color: #faf7ef;">[‘bat‘,‘hut‘]

6、匹配所有合法的python标识符

s="awoeur awier [email?protected]# @#4_-asdf3$^&()+?><dfg$n$"

content=re.findall(r".*",re.DOTALL)

print s

awoeur awier [email?protected]# @#4_-asdf3$^&()+?><dfg$

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[‘awoeur awier [email?protected]# @#4_-asdf3$^&()+?><dfg$n$‘,‘‘]

7、提取每行中完整的年月日和时间字段

s="""se234 1987-02-09 07:30:00

??? 1987-02-10 07:25:00"""

content=re.findall(r"d{4}-d{2}-d{2} d{2}:d{2}:d{2}",sans-serif; background-color: #faf7ef;">se234 1987-02-09 07:30:00

??? 1987-02-10 07:25:00

[‘1987-02-09 07:30:00‘,‘1987-02-10 07:25:00‘]

8、将每行中的电子邮件地址替换为你自己的电子邮件地址

s="""[email?protected],[email?protected],[email?protected]

??? [email?protected],[email?protected]

??? [email?protected]"""

content=re.sub(r"[email?protected]w+.com","[email?protected]",sans-serif; background-color: #faf7ef;">print "_______________________________________"

[email?protected],[email?protected],[email?protected]

??? [email?protected],[email?protected]

??? [email?protected]

_______________________________________

[email?protected],[email?protected],[email?protected]

??? [email?protected],[email?protected]

??? [email?protected]

9、匹配home关键字：

>>> re.findall(r"home","skjdfoijower home?? homewer")

[‘home‘,‘home‘]

1、使用正则提取出字符串中的单词

s="""i love you not because of who 234 you are,234 but 3234ser because of who i am when i am with you"""

content=re.findall(r"b[a-zA-Z]+b",‘of‘,‘who‘,‘are‘,‘am‘,‘when‘,‘with‘,‘you‘]

2、使用正则表达式匹配合法的邮件地址：

s="""[email?protected],[email?protected] [email?protected] [email?protected] [email?protected] saldkfj.com [email?protected]"""

content=re.findall(r"[email?protected]w+.com",sans-serif; background-color: #faf7ef;">[‘[email?protected]‘,‘[email?protected]‘,‘[email?protected]‘,‘[email?protected]‘]