(编辑:jimmy 日期: 2024/12/26 浏览:2)
import re text = "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
import re text = "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 re names = ["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
import re text = "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 re ret = re.match("[1-9]","7") print(ret.group()) ret = re.match("[1-9]","33") print(ret.group()) ret = re.match("[1-9]","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
import re text = "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 re ret = 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
import re text = "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