在第二次出现字符后拆分文本 [英] Split text after the second occurrence of character

问题描述

我需要在第二次出现-"字符之前拆分文本.我现在所拥有的是产生不一致的结果.我尝试了 rsplit 的各种组合，并通读并尝试了其他解决方案，但没有结果.

要拆分的示例文件名:'some-sample-filename-to-split' 在 data.filename 中返回.在这种情况下，我只想返回 'some-sample' .

fname, extname = os.path.splitext(data.filename)file_label = fname.rsplit('/',1)[-1]file_label2 = file_label.rsplit('-',maxsplit=3)打印(file_label2,'\n','--------------','\n')

解决方案

你可以这样做:

<预><代码>>>>a =一些样本文件名到拆分"；>>>"-".join(a.split("-", 2)[:2])'一些样本'

a.split("-", 2) 会将字符串拆分到第二次出现 - 为止.

a.split("-", 2)[:2] 将给出列表中的前 2 个元素.然后简单地加入前 2 个元素.

或

你可以使用正则表达式:^([\w]+-[\w]+)

<预><代码>>>>进口重新>>>reg = r'^([\w]+-[\w]+)'>>>re.match(reg, a).group()'一些样本'

正如评论中所讨论的，这是您需要的:

def hyphen_split(a):如果 a.count("-") == 1:return a.split("-")[0]返回-".join(a.split(-", 2)[:2])>>>连字符_拆分(一些样本文件名到拆分")'一些样本'>>>连字符_分裂(一些样本")'一些'

I need to split text before the second occurrence of the '-' character. What I have now is producing inconsistent results. I've tried various combinations of rsplit and read through and tried other solutions on SO, with no results.

Sample file name to split: 'some-sample-filename-to-split' returned in data.filename. In this case, I would only like to have 'some-sample' returned.

fname, extname = os.path.splitext(data.filename)
file_label = fname.rsplit('/',1)[-1]
file_label2 = file_label.rsplit('-',maxsplit=3)
print(file_label2,'\n','---------------','\n')

解决方案

You can do something like this:

>>> a = "some-sample-filename-to-split"
>>> "-".join(a.split("-", 2)[:2])
'some-sample'

a.split("-", 2) will split the string upto the second occurrence of -.

a.split("-", 2)[:2] will give the first 2 elements in the list. Then simply join the first 2 elements.

OR

You could use regular expression : ^([\w]+-[\w]+)

>>> import re
>>> reg = r'^([\w]+-[\w]+)'
>>> re.match(reg, a).group()
'some-sample'

EDIT: As discussed in the comments, here is what you need:

def hyphen_split(a):
    if a.count("-") == 1:
        return a.split("-")[0]
    return "-".join(a.split("-", 2)[:2])

>>> hyphen_split("some-sample-filename-to-split")
'some-sample'
>>> hyphen_split("some-sample")
'some'

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