正则表达式练习：匹配手机号、匹配单词、匹配ip

1、匹配手机号

>>> re.findall(r"\d{11}","abc13988889999cde13810635189")
['13988889999', '13810635189']
>>>
>>> re.findall(r"\d{11}","abc13988889999cde1381063518923")
['13988889999', '13810635189']

>>> re.findall(r"\b\d{11}\b","abc 13988889999 cde 13810635189")
['13988889999', '13810635189']

2、匹配单词

>>> re.findall(r"[a-zA-Z]+","I am a good boy!You too!~")
['I', 'am', 'a', 'good', 'boy', 'You', 'too']


>>> len(re.findall(r"[a-zA-Z]+","I am a good boy!You too!~"))
7

3、匹配IP：xxx.xxx.xxx.xxx   四段数字，三个点（匹配最简单的，比较复杂的就不验证了）

>>> re.search(r"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}","0.1.22.168")
<_sre.SRE_Match object; span=(0, 10), match='0.1.22.168'>