使用正则表达式计算大写、小写、特殊字符和数值的Python程序

先决条件： Python中的正则表达式
给定一个字符串。任务是使用Python中的正则表达式计算字符串中出现的大写字母、小写字母、特殊字符和数值的数量。
例子：

Input : 
"ThisIsGeeksforGeeks!, 123" 

Output :
No. of uppercase characters = 4
No. of lowercase characters = 15
No. of numerical characters = 3
No. of special characters = 2

方法： re.findall(pattern, 字符串, flags=0) 方法可用于查找字符串中模式的所有非重叠匹配。返回值是一个字符串列表。
下面是实现。

Python3

import re
 
 
string = "ThisIsGeeksforGeeks !, 123"
 
# Creating separate lists using
# the re.findall() method.
uppercase_characters = re.findall(r"[A-Z]", string)
lowercase_characters = re.findall(r"[a-z]", string)
numerical_characters = re.findall(r"[0-9]", string)
special_characters = re.findall(r"[, .!?]", string)
 
print("The no. of uppercase characters is", len(uppercase_characters))
print("The no. of lowercase characters is", len(lowercase_characters))
print("The no. of numerical characters is", len(numerical_characters))
print("The no. of special characters is", len(special_characters))

输出：

The no. of uppercase characters is 4
The no. of lowercase characters is 15
The no. of numerical characters is 3
The no. of special characters is 4