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检查字符串是否以XXXX开头

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问题：检查字符串是否以XXXX开头
回答 0
回答 1
回答 2
回答 3

问题：检查字符串是否以XXXX开头

我想知道如何检查Python中字符串是否以“ hello”开头。

在Bash中，我通常这样做：

if [[ "$string" =~ ^hello ]]; then
 do something here
fi

如何在Python中实现相同的目标？

点击查看英文原文

I would like to know how to check whether a string starts with “hello” in Python.

In Bash I usually do:

if [[ "$string" =~ ^hello ]]; then
 do something here
fi

How do I achieve the same in Python?

回答 0

aString = "hello world"
aString.startswith("hello")

有关的更多信息startswith。

点击查看英文原文 
aString = "hello world"
aString.startswith("hello")

More info about startswith.

回答 1

RanRag已经回答了您的特定问题。

但是，更一般地说，您在做什么

if [[ "$string" =~ ^hello ]]

是正则表达式匹配。要在Python中执行相同的操作，您可以执行以下操作：

import re
if re.match(r'^hello', somestring):
    # do stuff

显然，在这种情况下somestring.startswith('hello')更好。

点击查看英文原文

RanRag has already answered it for your specific question.

However, more generally, what you are doing with

if [[ "$string" =~ ^hello ]]

is a regex match. To do the same in Python, you would do:

import re
if re.match(r'^hello', somestring):
    # do stuff

Obviously, in this case, somestring.startswith('hello') is better.

回答 2

如果您想将多个单词与魔术单词匹配，则可以将单词匹配为元组：

>>> magicWord = 'zzzTest'
>>> magicWord.startswith(('zzz', 'yyy', 'rrr'))
True

注意：startswith需str or a tuple of str

请参阅文档。

点击查看英文原文

In case you want to match multiple words to your magic word you can pass the words to match as a tuple:

>>> magicWord = 'zzzTest'
>>> magicWord.startswith(('zzz', 'yyy', 'rrr'))
True

Note: startswith takes str or a tuple of str

See the docs.

回答 3

也可以这样

regex=re.compile('^hello')

## THIS WAY YOU CAN CHECK FOR MULTIPLE STRINGS
## LIKE
## regex=re.compile('^hello|^john|^world')

if re.match(regex, somestring):
    print("Yes")
点击查看英文原文

Can also be done this way..

regex=re.compile('^hello')

## THIS WAY YOU CAN CHECK FOR MULTIPLE STRINGS
## LIKE
## regex=re.compile('^hello|^john|^world')

if re.match(regex, somestring):
    print("Yes")