【Pyton】【小甲鱼】正则表达式（一）

正则表达式学习：

>>> import re
>>> re.search(r'FishC','I love FishC.com!')
<_sre.SRE_Match object; span=(7, 12), match='FishC'>
>>> "I love FishC.com!".find('FishC')
7
>>> re.search(r'.','I love FishC.com!')
<_sre.SRE_Match object; span=(0, 1), match='I'>
>>> re.search(r'fish.','I love FishC.com!')
>>> re.search(r'Fish.','I love FishC.com!')
<_sre.SRE_Match object; span=(7, 12), match='FishC'>
>>> re.search(r'.','I love FishC.com!')
<_sre.SRE_Match object; span=(12, 13), match='.'>
>>> re.search(r'd','I love 123 FishC.com!')
<_sre.SRE_Match object; span=(7, 8), match='1'>
>>> re.search(r'ddd','I love 123 FishC.com!')
<_sre.SRE_Match object; span=(7, 10), match='123'>
>>> re.search(r'ddd.ddd.ddd','192.168.111.123')
<_sre.SRE_Match object; span=(0, 11), match='192.168.111'>
>>> re.search(r'ddd.ddd.ddd','192.168.1.1')
>>> re.search(r'[aeiou]',"I love FishC.com!")
<_sre.SRE_Match object; span=(3, 4), match='o'>
>>> re.search(r'[aeiouAEIOU]',"I love FishC.com!")
<_sre.SRE_Match object; span=(0, 1), match='I'>
>>> re.search(r'[a-z]',"I love FishC.com!")
<_sre.SRE_Match object; span=(2, 3), match='l'>
>>> re.search(r'[0-9]',"I love 123 FishC.com!")
<_sre.SRE_Match object; span=(7, 8), match='1'>
>>> re.search(r'[2-9]',"I love 123 FishC.com!")
<_sre.SRE_Match object; span=(8, 9), match='2'>
>>> re.search(r'ab{3}c','abbbc')
<_sre.SRE_Match object; span=(0, 5), match='abbbc'>
>>> re.search(r'ab{3}c','abbbbbbbc')
>>> re.search(r'ab{3-10}c','abbbbbbbc')
>>> re.search(r'ab{3,10}c','abbbbbbbc')
<_sre.SRE_Match object; span=(0, 9), match='abbbbbbbc'>
>>> re.search(r'ab{3,10}c','abbbbbbbc')
<_sre.SRE_Match object; span=(0, 9), match='abbbbbbbc'>
>>> re.search(r'[0-255]','188')
<_sre.SRE_Match object; span=(0, 1), match='1'>
>>> re.search(r'[0-2]dd|2[0-4]d|25[0-5]','188')
<_sre.SRE_Match object; span=(0, 3), match='188'>
>>> re.search(r'(([01]{0,1}d{0,1}d|2[0-4]d|25[0-5]).){3}([01]{0,1}d{0,1}d|2[0-4]d|25[0-5])','192.168.1.1')
<_sre.SRE_Match object; span=(0, 11), match='192.168.1.1'>