在文本文件中使用正则表达式在特定字符串之前查找单词

如何解决在文本文件中使用正则表达式在特定字符串之前查找单词

我对正则表达式世界非常陌生。我所拥有的是一个文本文件，我想在其中的特定字符串（在这种情况下为“ out”）之前找到一个特定的单词并将其存储到变量中。所以我可以在代码的后面用其他东西替换它。在下面，我将放在我正在寻找的有趣的单词中，仅用于突出显示目的。如果有人能指出我正确的方向，那就太好了。 我拥有的文本文件如下：在这种情况下，我想查找以突出显示的单词。如果我的问题不太清楚，我无法描述我要寻找的东西，我提前道歉。

  neighbor 10.242.1.1 route-map LOCAL_PREF in
  neighbor 10.242.1.1 route-map <grn200_NWK> out   
  neighbor 10.244.206.2 route-map LOCAL_PREF in
  neighbor 10.244.206.2 route-map <blu330_NWK> out
  neighbor 10.242.120.202 route-map LOCAL_PREF in
  neighbor 10.242.120.202 route-map <grn200_NWK> out
.
.
.
the text file continues in this pattern

解决方法

假设文件名为FailedPreconditionError: Error while reading resource variable rnn/multi_rnn_cell/cell_1/lstm_cell/kernel from Container: localhost. This could mean that the variable was uninitialized. Not found: Container localhost does not exist. (Could not find resource: localhost/rnn/multi_rnn_cell/cell_1/lstm_cell/kernel) [[{{node rnn/multi_rnn_cell/cell_1/lstm_cell/kernel/Read/ReadVariableOp}}]] During handling of the above exception,another exception occurred: FailedPreconditionError Traceback (most recent call last) /usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py in _do_call(self,fn,*args) 1382 '\nsession_config.graph_options.rewrite_options.' 1383 'disable_meta_optimizer = True') -> 1384 raise type(e)(node_def,op,message) 1385 1386 def _extend_graph(self): FailedPreconditionError: Error while reading resource variable rnn/multi_rnn_cell/cell_1/lstm_cell/kernel from Container: localhost. This could mean that the variable was uninitialized. Not found: Container localhost does not exist. (Could not find resource: localhost/rnn/multi_rnn_cell/cell_1/lstm_cell/kernel) [[node rnn/multi_rnn_cell/cell_1/lstm_cell/kernel/Read/ReadVariableOp (defined at <ipython-input-11-60d6e5975cd9>:18) ]] ，则可以提取所有行，并使用正则表达式获取所需的所有数据。

file.txt

结果：

import re with open('file.txt') as f: contents = f.readlines() # get the lines in a list for x in contents: # iterate through each line matched = re.search(r'\S+ out$',x) # find results if matched: result.append(matched.group().split(" ")[0]) # save results print(result)

这将通过获取文件中的所有行，然后循环浏览，查找文本并将其保存在名为['blu330_NWK','grn200_NWK']的列表中，来打印所需的所有结果。然后，您可以使用它来获取变量中的值。

我相信这种解决方案更容易理解，因为它只是循环浏览并找到结果。

,

您可以使用捕获组找到所需的单词。根据构成单词（表情符号？）的不同，它可能会略有不同。以下是一个广泛的定义-没有空格的任何内容。在此示例中，我仅将搜索结果存储在每一行上。无表示不匹配。否则，它是一个搜索对象，其中group(1)是找到的单词，start()是其开始索引，end()是其结束索引。举个例子，我将单词改为“ foo”。

import re

with open('foo.txt') as fileobj:
    searches = [(re.search(r"(\S+) out$",line.strip()) for line in fileobj]

matched = []
for match,line in searches:
    if match:
        print("matched",match.group(1))
        matched.append(line[:match.start()] + "foo" + line[match.end():]