Question

我正在尝试在两个关键字之间搜索文字。到目前为止，我的解决方案是使用split()将字符串更改为列表。它有效，但我想知道是否有更有效/优雅的方式来实现这一目标。以下是我的代码：

words = "Your meeting with Dr Green at 8pm"
list_words = words.split()
before = "with"
after = "at"
title = list_words[list_words.index(before) + 1]
name = list_words[list_words.index(after) - 1]


if title != name:
    var = title + " " + name
    print(var)
else:
    print(title)

结果：

>>> Dr Green

我更喜欢可配置的解决方案，因为我搜索的文字可以是动态的，因此格林博士可以用4个字或1个字的名称替换。

Answer 1

听起来像正则表达式的工作。这使用模式(?:with)(.*?)(?:at)来查找＆＃39;和＆＃39;＆＃39;＆＃39;＆＃39;，并且懒洋洋地匹配中间的任何内容。

import re

words = 'Your meeting with Dr Green at 8pm'
start = 'with'
end = 'at'

pattern = r'(?:{})(.*?)(?:{})'.format(start, end)
match = re.search(pattern, words).group(1).strip()
print(match)

输出;

Dr Green

请注意，正则表达式确实匹配Dr Green两侧的空格，我包含了一个简单的match.strip()来删除尾随空格。

Answer 2

使用RE

import re
words = "Your meeting with Dr Green at 8pm"
before = "Dr"
after = "at"
result = re.search('%s(.*)%s' % (before, after), words).group(1)
print before + result

输出：

Dr Green

Answer 3

如何在开始和结束时切割列表，然后将其拆分？

words = "Your meeting with Dr Jebediah Caruseum Green at 8pm"
start = "with"
end = "at"    
list_of_stuff = words[words.index(start):words.index(end)].replace(start, '', 1).split()
list_of_stuff 
['Dr', 'Jebediah', 'Caruseum', 'Green']

您可以使用列表执行任何您喜欢的操作。例如，我会解析这样的标题：

list_of_titles = ['Dr', 'Sr', 'GrandMaster', 'Pleb']
try:
    title = [i for i in list_of_stuff if i in list_of_titles][0]
except IndexError:
    #title not found, skipping
    title = ''
name = ' '.join([x for x in list_of_stuff if x != title])
print(title, name)

Pythonic使用关键字搜索列表的方法

3 个答案: