【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=''>
 >>> re.search(r'\d\d\d','I love 123 FishC.com!')
 <_sre.SRE_Match object; span=(7, 10), match=''>
 >>> re.search(r'\d\d\d.\d\d\d.\d\d\d','192.168.111.123')
 <_sre.SRE_Match object; span=(0, 11), match='192.168.111'>
 >>> re.search(r'\d\d\d.\d\d\d.\d\d\d','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=''>
 >>> re.search(r'[2-9]',"I love 123 FishC.com!")
 <_sre.SRE_Match object; span=(8, 9), match=''>
 >>> 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]','')
 <_sre.SRE_Match object; span=(0, 1), match=''>
 >>> re.search(r'[0-2]\d\d|2[0-4]\d|25[0-5]','')
 <_sre.SRE_Match object; span=(0, 3), match=''>
 >>> 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'>