【小甲鱼】【Python】正则表达式（二）

 >>> import re
#|表示或的意思
 >>> re.search(r"Fish(C|D)","FishC")
 <_sre.SRE_Match object; span=(0, 5), match='FishC'>
 >>> re.search(r"Fish(C|D)","FishE")
 >>> re.search(r"^FishC","Fish")
 >>> re.search(r"^FishC","FishC dfadf")
 <_sre.SRE_Match object; span=(0, 5), match='FishC'>
#^表示以什么开头
 >>> re.search(r"^FishC","I FishC dfadf")
#$表示以什么结尾
 >>> re.search(r"FishC$","I FishC dfadf")
 >>> re.search(r"FishC$","I FishC dfadfFishC")
 <_sre.SRE_Match object; span=(13, 18), match='FishC'>
#表示查找回车
 >>> re.search(r"[\n]","I FishC dfadfFishC\n")
 <_sre.SRE_Match object; span=(18, 19), match='\n'>
#[^...]表示查找除了...条件外的数据
 >>> re.search(r"[^a-z]","I FishC dfadfFishC\n")
 <_sre.SRE_Match object; span=(0, 1), match='I'>

#[^...]表示查找...条件的数据
 >>> re.search(r"[a-z^]","I FishC dfadfFishC\n") 
 <_sre.SRE_Match object; span=(3, 4), match='i'> 
 >>> re.findall(r"[a-z^]","I FishC dfadfFishC\n") 
 ['i', 's', 'h', 'd', 'f', 'a', 'd', 'f', 'i', 's', 'h'] 
 >>> re.findall(r"[^a-z]","I FishC dfadfFishC\n")
  ['I', ' ', 'F', 'C', ' ', 'F', 'C', '\n'] 
 #\1表示重复一次 
 >>> re.search(r"(FishC)\1","FishCFishC") 
 <_sre.SRE_Match object; span=(0, 10), match='FishCFishC'> 
 #141是八进制的a(十进制ASCII值为97)值 
 >>> re.search(r"(FishC)\141","FishCFishC")
 >>> re.search(r"(FishC)\141","FishCFishCa") 
 <_sre.SRE_Match object; span=(5, 11), match='FishCa'>
 >>> re.search(r"(FishC)\060","FishCFishCa") 
 >>> re.search(r"(FishC)\060","FishCFishC0")
 <_sre.SRE_Match object; span=(5, 11), match='FishC0'>
 >>> re.search(r"\.","FishCFishC0.com") 
 <_sre.SRE_Match object; span=(11, 12), match='.'> 
 >>> re.search(r"[.]","FishCFishC0.com") 
 <_sre.SRE_Match object; span=(11, 12), match='.'> 
 >>> re.search(r"C*","FishCFishC0.com") 
 <_sre.SRE_Match object; span=(0, 0), match=''> 
 #*表示重复无限次 
 >>> re.search(r"(FishC)*","FishCFishC0.com") 
 <_sre.SRE_Match object; span=(0, 10), match='FishCFishC'> 
 #+表示重复1到无限次 
 >>> re.search(r"(FishC)+","FishCFishC0.com")
 <_sre.SRE_Match object; span=(0, 10), match='FishCFishC'>
 #？表示重复0或1次 
 >>> re.search(r"(FishC)?","FishCFishC0.com") 
 <_sre.SRE_Match object; span=(0, 5), match='FishC'> 
 >>> s="<html><title>I love FishC.com</title></html>" 
 >>> re.search(r"<.+>",s) 
 <_sre.SRE_Match object; span=(0, 44), match='<html><title>I love FishC.com</title></html>'> 
 >>> re.search(r"<.+?>",s) 
 <_sre.SRE_Match object; span=(0, 6), match='<html>'>