使用python字符串中的re.findall来查找以大写字母开头的项目？

发布于 2025-02-09 12:17:03 字数 362 浏览 1 评论 0原文

如果我有一个python字符串，我该如何使用re.findall仅提取以大写字母开头的项目？

我的字符串看起来像这样：

my_string = ['a17b', 'Cupcake', '8ikl3', 'Dinosaur']

我希望我的提取的字符串看起来像：

new_string = ['Cupcake', 'Dinosaur']

这是我的代码到目前为止（不正确）：

import re
new_string = re.findall(r'[^A-Z]', my_string)

我要在哪里出错？谢谢。

原文

If I have a Python string, how can I use re.findall to extract only the items that start with a capital letter?

My string looks like this:

my_string = ['a17b', 'Cupcake', '8ikl3', 'Dinosaur']

I want my extracted string to look like this:

new_string = ['Cupcake', 'Dinosaur']

Here's my code so far (not correct):

import re
new_string = re.findall(r'[^A-Z]', my_string)

Where am I going wrong? Thank you.

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惟欲睡 2025-02-16 12:17:03

您不需要re：只需使用str.isupper

[i for i in my_string if i[:1].isupper()]

输出：

['Cupcake', 'Dinosaur']

You don't need re: just use str.isupper

[i for i in my_string if i[:1].isupper()]

Output:

['Cupcake', 'Dinosaur']

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很酷又爱笑 2025-02-16 12:17:03

那不是字符串。那是字符串清单。您需要类似的东西：

newlst = [k for k in my_string if 'A' <= k[0] <= 'Z']

That's not a string. That's a list of strings. You'll need something like:

newlst = [k for k in my_string if 'A' <= k[0] <= 'Z']

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哑剧 2025-02-16 12:17:03

import re

my_string = ['a17b', 'Cupcake', '8ikl3', 'Dinosaur']
pattern = re.compile(r'^[A-Z]')
new_string = [i for i in my_string if pattern.match(i)] 
print(new_string)

输出：

['蛋糕'，'恐龙']

import re

my_string = ['a17b', 'Cupcake', '8ikl3', 'Dinosaur']
pattern = re.compile(r'^[A-Z]')
new_string = [i for i in my_string if pattern.match(i)] 
print(new_string)

Output:

['Cupcake', 'Dinosaur']

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雨的味道风的声音 2025-02-16 12:17:03

为什么它不起作用：

findall（）搜索一个字符串，但是您在字符串列表中传递了
表达式[^az]将返回 的字符不是 在AZ范围内
您要复制整个单词，但是您只要求第一个字母

修复：

#join the list of strings to get yourself a string that will work with findall()

my_string = ['a17b', 'Cupcake', '8ikl3', 'Dinosaur']
my_string = ' '.join(my_string)

new_string = ['Cupcake', 'Dinosaur']

expression = r'[A-Z][\w]*'
#now re will find all words with capitalized first letters
new_string = re.findall(expression, my_string)

new_string

解码表达式（'[az] \ w*'）

[az]查找大写字母
\ w查找字符
\*告诉RE告诉RE查找上一项或多个上

一项值得检查的资源值得检查OUT是 https://regex101.com

Why it doesn't work:

findall() searches a string, but you passed in a list of strings
The expression [^A-Z] will return characters that are not in the range A-Z
You want to copy the entire word, but you're only asking for the first letter

How to fix:

#join the list of strings to get yourself a string that will work with findall()

my_string = ['a17b', 'Cupcake', '8ikl3', 'Dinosaur']
my_string = ' '.join(my_string)

new_string = ['Cupcake', 'Dinosaur']

expression = r'[A-Z][\w]*'
#now re will find all words with capitalized first letters
new_string = re.findall(expression, my_string)

new_string