正则表达式匹配单个字符（. [] \d \D \s \S \w \W）

匹配单个字符:

示例1： .

import reret = re.match(".","M")print(ret.group())ret = re.match("t.o","too")print(ret.group())ret = re.match("t.o","two")print(ret.group())

运行结果：

示例2：[]

import re# 如果hello的首字符小写，那么正则表达式需要小写的hret = re.match("h", "hello Python")print(ret.group())# 如果hello的首字符大写，那么正则表达式需要大写的Hret = re.match("H", "Hello Python")print(ret.group())# 大小写h都可以的情况ret = re.match("[hH]", "hello Python")print(ret.group())ret = re.match("[hH]", "Hello Python")print(ret.group())ret = re.match("[hH]ello Python", "Hello Python")print(ret.group())# 匹配0到9第一种写法ret = re.match("[0123456789]Hello Python","7Hello Python")print(ret.group())# 匹配0到9第二种写法ret = re.match("[0-9]Hello Python", "7Hello Python")print(ret.group())ret = re.match("[0-35-9]Hello Python", "7Hello Python")print(ret.group())# 下面这个正则不能够匹配到数字4，因此ret为Noneret = re.match("[0-35-9]Hello Python", "4Hello Python") # 0~3，5~9分段，不包括4# print(ret.group()) # 这样写直接会报错的

运行结果：

示例3：\d

import re# 普通的匹配方式ret = re.match("嫦娥1号","嫦娥1号发射成功") print(ret.group())ret = re.match("嫦娥2号","嫦娥2号发射成功") print(ret.group())ret = re.match("嫦娥3号","嫦娥3号发射成功") print(ret.group())# 使用\d进行匹配ret = re.match("嫦娥\d号","嫦娥1号发射成功") print(ret.group())ret = re.match("嫦娥\d号","嫦娥2号发射成功") print(ret.group())ret = re.match("嫦娥\d号","嫦娥3号发射成功") print(ret.group())

运行结果：

示例4：\D

import rematch_obj = re.match("\D", "a")if match_obj:# 获取匹配结果print(match_obj.group())else:print("匹配失败")

运行结果:

示例5：\s

import re# 空格属于空白字符match_obj = re.match("hello\sworld", "hello world")if match_obj:result = match_obj.group()print(result)else:print("匹配失败")# \t 属于空白字符match_obj = re.match("hello\sworld", "hello\tworld")if match_obj:result = match_obj.group()print(result)else:print("匹配失败")

运行结果:

示例6：\S

import rematch_obj = re.match("hello\Sworld", "hello&world")if match_obj:result = match_obj.group()print(result)else:print("匹配失败")match_obj = re.match("hello\Sworld", "hello$world")if match_obj:result = match_obj.group()print(result)else:print("匹配失败")

运行结果:

示例7：\w

import re# 匹配非特殊字符中的一位match_obj = re.match("\w", "A")if match_obj:# 获取匹配结果print(match_obj.group())else:print("匹配失败")

执行结果:

示例8：\W

import re# 匹配特殊字符中的一位match_obj = re.match("\W", "&")if match_obj:# 获取匹配结果print(match_obj.group())else:print("匹配失败")

执行结果:

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