1 >>> import re
#|表示或的意思
2 >>> re.search(r"Fish(C|D)","FishC")
3 <_sre.SRE_Match object; span=(0, 5), match='FishC'>
4 >>> re.search(r"Fish(C|D)","FishE")
5 >>> re.search(r"^FishC","Fish")
6 >>> re.search(r"^FishC","FishC dfadf")
7 <_sre.SRE_Match object; span=(0, 5), match='FishC'>
#^表示以什么开头
8 >>> re.search(r"^FishC","I FishC dfadf")
#$表示以什么结尾
9 >>> re.search(r"FishC$","I FishC dfadf")
10 >>> re.search(r"FishC$","I FishC dfadfFishC")
11 <_sre.SRE_Match object; span=(13, 18), match='FishC'>
#表示查找回车
12 >>> re.search(r"[
]","I FishC dfadfFishC
")
13 <_sre.SRE_Match object; span=(18, 19), match='
'>
#[^...]表示查找除了...条件外的数据
14 >>> re.search(r"[^a-z]","I FishC dfadfFishC
")
15 <_sre.SRE_Match object; span=(0, 1), match='I'>
#[^...]表示查找...条件的数据
16 >>> re.search(r"[a-z^]","I FishC dfadfFishC
")
17 <_sre.SRE_Match object; span=(3, 4), match='i'>
18 >>> re.findall(r"[a-z^]","I FishC dfadfFishC
")
19 ['i', 's', 'h', 'd', 'f', 'a', 'd', 'f', 'i', 's', 'h']
20 >>> re.findall(r"[^a-z]","I FishC dfadfFishC
")
21 ['I', ' ', 'F', 'C', ' ', 'F', 'C', '
']
22 #1表示重复一次
23 >>> re.search(r"(FishC)1","FishCFishC")
24 <_sre.SRE_Match object; span=(0, 10), match='FishCFishC'>
25 #141是八进制的a(十进制ASCII值为97)值
26 >>> re.search(r"(FishC)141","FishCFishC")
27 >>> re.search(r"(FishC)141","FishCFishCa")
28 <_sre.SRE_Match object; span=(5, 11), match='FishCa'>
29 >>> re.search(r"(FishC) 60","FishCFishCa")
30 >>> re.search(r"(FishC) 60","FishCFishC0")
31 <_sre.SRE_Match object; span=(5, 11), match='FishC0'>
32 >>> re.search(r".","FishCFishC0.com")
33 <_sre.SRE_Match object; span=(11, 12), match='.'>
34 >>> re.search(r"[.]","FishCFishC0.com")
35 <_sre.SRE_Match object; span=(11, 12), match='.'>
36 >>> re.search(r"C*","FishCFishC0.com")
37 <_sre.SRE_Match object; span=(0, 0), match=''>
38 #*表示重复无限次
39 >>> re.search(r"(FishC)*","FishCFishC0.com")
40 <_sre.SRE_Match object; span=(0, 10), match='FishCFishC'>
41 #+表示重复1到无限次
42 >>> re.search(r"(FishC)+","FishCFishC0.com")
43 <_sre.SRE_Match object; span=(0, 10), match='FishCFishC'>
44 #？表示重复0或1次
45 >>> re.search(r"(FishC)?","FishCFishC0.com")
46 <_sre.SRE_Match object; span=(0, 5), match='FishC'>
47 >>> s="<html><title>I love FishC.com</title></html>"
48 >>> re.search(r"<.+>",s)
49 <_sre.SRE_Match object; span=(0, 44), match='<html><title>I love FishC.com</title></html>'>
50 >>> re.search(r"<.+?>",s)
51 <_sre.SRE_Match object; span=(0, 6), match='<html>'>