1. *表示匹配任意多个字符 \\d*表示匹配任意多个数字字符
import retext = \"123h1ello world\"text1 = \"123Hello world456\"text2 = \"hello world\"res = re.match(\"\\d*\", text)res1 = re.match(\"\\d*\", text1)res2 = re.match(\"\\d*\", text2)print(res.group())print(res1.group())print(res2.group())
输出结果为
123
123Process finished with exit code 0
示例2:*
需求:匹配出,一个字符串第一个字母为大小字符,后面都是小写字母并且这些小写字母可有可无
import re#注意是前一个字符ret = re.match(\"[A-Z][a-z]*\",\"M\")print(ret.group())ret = re.match(\"[A-Z][a-z]*\",\"AaBcDE\")print(ret.group())ret = re.match(\"[A-Z][a-z]*\",\"Aabcdef\")print(ret.group())
#运行结果
M
Aa
Aabcdef
2. +表示匹配1个或者多个任意字符 \\w+表示匹配一个或多个字母,数字或下划线
import retext = \"he+llo world\"text1 = \"Hello world456\"text2 = \"+hello world\"res = re.match(\"\\w+\", text)res1 = re.match(\"\\w+\", text1)res2 = re.match(\"\\w+\", text2)print(res.group())print(res1.group())print(res2)
输出结果为
he
Hello
NoneProcess finished with exit code 0
示例2:+
需求:匹配出,变量名是否有效
import renames = [\"name1\",\"_name\",\"2_name\",\"__name__\"]for i in names:ret = re.match(\"[a-zA-Z_]+[\\w]*\",i)if ret:print(\"变量名 %s 符合要求\" % ret.group())else:print(\"变量名 %s 非法\" % i)
#运行结果
变量名 name1 符合要求
变量名 _name 符合要求
变量名 2_name 非法
变量名 __name__ 符合要求
3. ?表示匹配0个或一个字符 \\w?表示匹配0或1个字母,数字或下划线
import retext = \"he+llo world\"text1 = \"Hello world456\"text2 = \"+hello world\"res = re.match(\"\\w?\", text)res1 = re.match(\"\\w?\", text1)res2 = re.match(\"\\w?\", text2)print(res.group())print(res1.group())print(res2.group())
输出结果为
h
HProcess finished with exit code 0
示例2:?
需求:匹配出0到99之间的数字
import reret = re.match(\"[1-9]?[0-9]\",\"7\")print(ret.group())ret = re.match(\"[1-9]?\\d\",\"33\")print(ret.group())ret = re.match(\"[1-9]?\\d\",\"09\")print(ret.group())
#运行结果
7
33
0 # 这个结果并不是想要的,利用$才能解决
4. {m}表示匹配m个字符 \\d{11}表示匹配11个数字字符
import retext = \"he+llo world\"text1 = \"Hello world456\"text2 = \"hello world\"res = re.match(\"\\w{2}\", text)res1 = re.match(\"\\w{3}\", text1)res2 = re.match(\"\\w{4}\", text2)print(res.group())print(res1.group())print(res2.group())
输出结果为
he
Hel
hellProcess finished with exit code 0
示例2:{m}
需求:匹配出,8到20位的密码,可以是大小写英文字母、数字、下划线
import reret = re.match(\"[a-zA-Z0-9_]{6}\",\"123a3g45678\")print(ret.group())ret = re.match(\"[[a-zA-Z0-9_]{8,20}\",\"1ad3123456addfcasdef\")print(ret.group())
#运行结果
123a3g
1ad3123456addfcasdef
5. {m,n}表示匹配m-n个字符 \\w{2,4}表示匹配2-4个字符
import retext = \"hello world\"text1 = \"Helloworld456\"text2 = \"hello world\"res = re.match(\"\\w{2,5}\", text)res1 = re.match(\"\\w{6,8}\", text1)res2 = re.match(\"\\w{20,25}\", text2)print(res.group())print(res1.group())print(res2)
hello
Hellowor
NoneProcess finished with exit code 0
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