字符串操作 - jython 中的 re.sub

发布于 2024-08-16 03:34:42 字数 515 浏览 12 评论 0原文

假设我有一个像这样的字符串“这是一个声明” 如果我想搜索字符串并将其替换为“this ** a statements”

字符串，以搜索 this is a statements 、 this si a statements 、 this ia statements 以及任何组合，将它们转换为此 trim一份声明即对于 this 和; 之间的任何单词组合语句将其替换为 trim 对于另一组，将 fun 替换为 notfun 。

所以这个程序

import re
file=open('file','r+')
search=re.sub('this \(a_zA_Z0_9)+ a statement','\1trim',file),('this is fun','this is notfun',file)
file.close()

有些不对劲，因为文件中没有任何变化。

谢谢大家。

原文

Let say i have a string like this 'this is a statement'
and if i want to search and replace string with this 'this ** a statement'

string to search for this is a statement , this si a statement , this i a statement and any combination convert them into this trim a statement
i.e for any word combination between this & a statement replace it with trim
for another set replace fun to notfun .

so this is the program

import re
file=open('file','r+')
search=re.sub('this \(a_zA_Z0_9)+ a statement','\1trim',file),('this is fun','this is notfun',file)
file.close()

something is not right as nothing is getting changed in the file.

thanks everyone.

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初见终念 2024-08-23 03:34:42

re.sub 不适用于文件，它适用于字符串。您需要将文件的内容读入字符串，然后使用 re.sub 更改字符串，然后将修改后的字符串写回到文件中。

一个简单的例子：

text = open("myfile.txt").read()
# This is your original re.sub call, but I'm not sure it really does what you want.
text = re.sub('this \(a_zA_Z0_9)+ a statement', '\1trim', text)
text = re.sub('this \(a_zA_Z0_9)+ another replacement', 'some other thing', text)
open("myfile.txt", "w").write(text)

re.sub doesn't work on files, it works on strings. You need to read the contents of the file into a string, then use re.sub to change the string, then write the modified string back to the file.

A simple example:

text = open("myfile.txt").read()
# This is your original re.sub call, but I'm not sure it really does what you want.
text = re.sub('this \(a_zA_Z0_9)+ a statement', '\1trim', text)
text = re.sub('this \(a_zA_Z0_9)+ another replacement', 'some other thing', text)
open("myfile.txt", "w").write(text)

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